ATAR Notes: Forum

Archived Discussion => Mathematics/Science/Technology => 2014 => Exam Discussion => Victoria => Further Mathematics => Topic started by: Dan1995 on October 31, 2014, 05:04:24 pm

Title: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 05:04:24 pm
Proposed answers are below! If you feel like something is incorrect, post what you think it is and why and if you're right, we'll change the original thread :)

Core.
1. B
2. D
3. C
4. D
5. B
6. A
7. C
8. E
9. B
10. E
11. E
12. A
13. C

Number Patterns
Spoiler
1. A
2. C
3. D
4. E
5. B
6. E
7. C
8. B
9. D

Geometry and Trigonometry
Spoiler
1. B
2. C
3. D
4. C
5. D
6. E
7. A
8. B
9. D

Graphs and Relations
Spoiler
1. B
2. E
3. D
4. B
5. A
6. D
7. B
8. B
9. C

Business-related Mathematics
Spoiler
1. D
2. C
3. C
4. E
5. C
6. D
7. B
8. D
9. E

Networks
Spoiler
1. D
2. D
3. C
4. A
5. A
6. B
7. E
8. E
9. D

Matrices.
Spoiler
1. A
2. B
3. B
4. C
5. C
6. E
7. D
8. E
9. C

Good luck with exam 2 everyone!
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: myanacondadont on October 31, 2014, 05:09:54 pm
Question 8. Are you sure it's E? That doesn't quite make sense to me.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: anonymous 774 on October 31, 2014, 05:11:25 pm
I think question 4 in core is D as postcode is categorical. Don't worry I made the same mistake!
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: anonymous 774 on October 31, 2014, 05:12:43 pm
I think question 6 in core is A
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: myanacondadont on October 31, 2014, 05:14:15 pm
I think question 4 in core is D as postcode is categorical. Don't worry I made the same mistake!

DAaaaaammit. I had this going through my mind but it's such a vast selection of categories so I decided to not include it in the sense that number of children could be considered categorical since it has a large amount of potential options. In my mind I thought it was just discrete data (postcode)
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Lucho23 on October 31, 2014, 05:14:28 pm
That Question 6 for Core was a tough one this year, however, drawing it on CAS produced A..not 100% though.
Question 9 for Core is B, -0.005, how'd you get C out of curiosity?
and Matrices Question 9 is C because B is actually the inverse of A
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 05:15:02 pm
Question 8. Are you sure it's E? That doesn't quite make sense to me.
Which question 8?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: anonymous 774 on October 31, 2014, 05:15:39 pm
I got C for question 5 in matrices
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: brenden on October 31, 2014, 05:15:58 pm
Copy of the exam anyone?! :)
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: myanacondadont on October 31, 2014, 05:16:02 pm
Which question 8?

Core. I got A
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Lucho23 on October 31, 2014, 05:17:12 pm
Tentative Solutions

Number Patterns

Graphs and Relations
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 05:18:08 pm
I think question 4 in core is D as postcode is categorical. Don't worry I made the same mistake!
Had that, made a typo. Changed it though, thanks!
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: myanacondadont on October 31, 2014, 05:18:19 pm
Tentative Solutions

Spoiler
Number Patterns
  • A
  • C
  • D
  • E
  • B
  • E
  • C
  • B
  • D

Graphs and Relations
  • B
  • E
  • D
  • B
  • A
  • D
  • B
  • B
  • C
[/list]

Got all those Graphs and Relations answers too. +1
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 05:20:29 pm
Core. I got A
That would've been for a single stemplot, for a back to back you need two categories.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: myanacondadont on October 31, 2014, 05:22:48 pm
That would've been for a single stemplot, for a back to back you need two categories.

AHhh fuck I'm retarded.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 05:23:22 pm
That Question 6 for Core was a tough one this year, however, drawing it on CAS produced A..not 100% though.
Question 9 for Core is B, -0.005, how'd you get C out of curiosity?
and Matrices Question 9 is C because B is actually the inverse of A
Got the same for matrices as you, checked it again after I posted.
For q9 in core you are correct, I may have entere the values incorrectly the first time.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Lucho23 on October 31, 2014, 05:26:19 pm
Got the same for matrices as you, checked it again after I posted.
For q9 in core you are correct, I may have entere the values incorrectly the first time.
Cool  :)
That Question 6 though, that was really unfair for this year, but, I do think it's A cause of the CAS.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Larri.e on October 31, 2014, 05:27:06 pm
For Core, I got:
4. D
6. A
8. C
9. B
12. C
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 05:28:38 pm
Cool  :)
That Question 6 though, that was really unfair for this year, but, I do think it's A cause of the CAS.
It's not too bad if you do the outlier calculations first.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Han123 on October 31, 2014, 05:31:03 pm
Hey Dan just curious, question 5 for matrices, how did you get A? :)
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Lucho23 on October 31, 2014, 05:32:22 pm
For Core, I got:
4. D
6. A
8. C
9. B
12. C

8. Its a back-to-back so its one numericla variable (already car speed) and you had to find the categorical variable with two parts, which is sex E
12. This was in 2011 Q12, check the assesors report. DS = AS/1.25 therefore DS = 0.8 x AS...this means AS has to be reduced by 20%
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 05:35:30 pm
For Core, I got:
4. D
6. A
8. C
9. B
12. C

Questions 4,6 and 9 and have been changed and discussed above.
Question 8 you needed to give the answer that contained two categorical variables, which was option E (male and female being the two categories).
Question 12 you actually want only 80% of the original sales, check the solutions from exam 1 in 2011, question 12, it was almost identical.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: bellaellaella on October 31, 2014, 05:36:05 pm
Cool  :)
That Question 6 though, that was really unfair for this year, but, I do think it's A cause of the CAS.

I did it by using the formula for the upper fence and working from there
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 05:37:28 pm
Hey Dan just curious, question 5 for matrices, how did you get A? :)
This is the problem with putting solutions up from a phone, that was also a typo! Sorry, the answer I got was C!
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Han123 on October 31, 2014, 05:40:55 pm
This is the problem with putting solutions up from a phone, that was also a typo! Sorry, the answer I got was C!

Oh thank god for that, thankyou for this! :)
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 05:41:52 pm
Oh thank god for that, thankyou for this! :)
No worries, thanks for pointing it out, before it panicked too many people hopefully!
What did you think of the exam overall?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: vididid on October 31, 2014, 05:42:35 pm
for 5 a for networks how is it a Hamiltonian path? i got b a Eulerian path as two of the vertices were odd and the others were even?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 05:44:53 pm
for 5 a for networks how is it a Hamiltonian path? i got b a Eulerian path as two of the vertices were odd and the others were even?
Question 5 in networks was about a minimal spanning tree?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: vididid on October 31, 2014, 05:45:47 pm
also question 9 for geometry how is it d? because if you do it using ratios of 81:36 after squaring the height and then cross multiplying to find x which i got was 80?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: vididid on October 31, 2014, 05:46:25 pm
sorry i meant question 1
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: vididid on October 31, 2014, 05:48:43 pm
ugh i had 6a for core and i changed it -.-
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 05:49:40 pm
also question 9 for geometry how is it d? because if you do it using ratios of 81:36 after squaring the height and then cross multiplying to find x which i got was 80?
The ratio is 25:9 (simplified), multiply by 180 gives 500, which is the area of the cone from the shaded part up (including the shaded part). It only wants the shaded part so 500-180=320.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 05:51:31 pm
sorry i meant question 1
You may want to read the question again, it told you the path the bus took, it had nothing to do with what paths were possible therefore the degrees of each vertice are not relevant for this question?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Scrono13 on October 31, 2014, 05:54:06 pm
Question 7 Networks, I had B. Could only make two of them planar?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: vididid on October 31, 2014, 05:54:23 pm
oh shit, ugh so stupid, but thankyou
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 05:55:23 pm
Question 7 Networks, I had B. Could only make two of them planar?
With a bit of rearranging, they can all be made planar.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: soysauce on October 31, 2014, 05:56:28 pm
Can someone please explain the following questions:
Core: 4,6,8,11,13
Trig: 6,9
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Kayleejohns on October 31, 2014, 05:56:56 pm
Could anyone explain why in core 12 is a?? I thought it was C, Thanks
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Sanguinne on October 31, 2014, 05:58:18 pm
Graphs and relations q7 are u sure it's b??
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 06:00:01 pm
Anyone got solutions for geo/trig and business?

Can someone please explain the following questions:
Core: 4,6,8,11,13
Geo and trig are up.

As for core:
4. Postcode counts as categorical, as does type of car and sex. Therefore 3 (D).
6.Either find your upper limit for outliers using Q3+1.5(IQR), or sketch on the calculator.
8.Back to back stemplots you need two categorical and a numerical variable, you have the numerical so you need the option that gives two categorical ones (Male and female so E)
11. Use the formula from the formula sheet d=a/si.
13.It does not increase or decrease from the lower median point and the upper median point, therefore the gradient is zero.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 06:00:54 pm
Could anyone explain why in core 12 is a?? I thought it was C, Thanks
Go to the 2011 examiners report and look at q12, its almost the same question.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Lucho23 on October 31, 2014, 06:01:00 pm
Graphs and relations q7 are u sure it's b??
The boundaries are, in this question, the corner points.
(0,0) => given
(0,6) => 3(0)+5(6) = 30
(5,3) => 5+3 = 8
(8,0) => 8+0 = 8
So all these points satisfy all inequalities.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Scrono13 on October 31, 2014, 06:01:47 pm
With a bit of rearranging, they can all be made planar.
100% sure?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 06:02:26 pm
Can someone please explain the following questions:
Core: 4,6,8,11,13
Trig: 6,9
Trig.
6.Use cosine rule to find angle CAB, then add it to 140 to get the bearing of C from A.
9. Explained above.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 06:03:30 pm
100% sure?
Yes, but which ones couldn't you make planar and I'll have a look?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Sanguinne on October 31, 2014, 06:04:28 pm
The boundaries are, in this question, the corner points.
(0,0) given
(0,6) => 3(0)+5(6) = 30
(5,3) => 5+3 = 8
(8,0) => 8+0 = 8
So all these points satisfy all inequalities.

That q8
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Scrono13 on October 31, 2014, 06:05:20 pm
1st and 2nd.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: jamespala on October 31, 2014, 06:06:15 pm
My results for Business someone please confirm for me
1.D
2.C
3.C
4.E
5.C
6.D
7.B
8.D
9.D
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 06:07:26 pm
1st and 2nd.
1st one. Take the very bottom  vertice up to the top so its above the top two, then if you redraw the edge from the top right to the bottom left it becomes planar.
2nd one. Swap the bottom left vertice with the place of the bottom right, and redraw the edge between them so it goes around the other vertices, and it becomes planar.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: I am simba on October 31, 2014, 06:08:44 pm
These solutions are unverified and may contain mistakes, if you find one please let me know and I'll modify the

Faa bro work on ur business maths.. most of the solutions are wrong.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 06:09:31 pm
These solutions are unverified and may contain mistakes, if you find one please let me know and I'll modify the

Faa bro work on ur business maths.. most of the solutions are wrong.
I didnt do the business solutions, i only did Core, Trig, Networks and matrices. The others were added by the admin.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: soysauce on October 31, 2014, 06:11:36 pm
Why is trig q9 not A...?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: DanielJ on October 31, 2014, 06:12:32 pm
My results for Business someone please confirm for me
1.D
2.C
3.C
4.E
5.C
6.D
7.B
8.D
9.D

Same answers as you, haven't lost a mark according to results on front page yet.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: IntelxD on October 31, 2014, 06:14:16 pm
My results for Business someone please confirm for me
1.D
2.C
3.C
4.E
5.C
6.D
7.B
8.D
9.D

All but 9 is correct. For question 9 you didn't calculate the interest that would also have to be payed on the $802.39. The answer should be E.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: NamasteLjubo on October 31, 2014, 06:14:43 pm
Did anyone else get E for question 9 in Business?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: IntelxD on October 31, 2014, 06:15:44 pm
Did anyone else get E for question 9 in Business?

Look above :)
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 06:15:52 pm
Why is trig q9 not A...?
How did you get A?

Its a scale factor question.
The area ratio is 15:9 (simplified), multiply that by 180 to get the area of the new cone, that includes the middle and top sections. This gives you 500, then subtract the area of the top cone, which was 180, to give an answer of 320.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: brenden on October 31, 2014, 06:17:47 pm
Business Math (not my answers, friend of mine)

1 D
2 C
3 C
4 E
5 C
6 D
7 B
8 D
9 D
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: DanielJ on October 31, 2014, 06:18:34 pm
All but 9 is correct. For question 9 you didn't calculate the interest that would also have to be payed on the $802.39. The answer should be E.

Yep... Can't believe I let that slip. 1 Mark dropped then. Damn
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: soysauce on October 31, 2014, 06:18:54 pm
Quote
How did you get A?

(I may be wrong here...)
two heights = 6 and 9
9/6 = 1.5 = k
k^2 (because area) = 2.25
2.25x = 180
x = 80
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: I am simba on October 31, 2014, 06:19:32 pm
Tentative solutions for Business related maths:
1.D
2.C
3.C
4.E
5.C
6.D
7.B
8.D
9.D
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: jamespala on October 31, 2014, 06:19:47 pm
All but 9 is correct. For question 9 you didn't calculate the interest that would also have to be payed on the $802.39. The answer should be E.

Damn :( well thank you for the correction :)
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: IntelxD on October 31, 2014, 06:20:58 pm
Damn :( well thank you for the correction :)

No problem. Keep your head up though, you still have exam 2 in which you can redeem yourself.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: NamasteLjubo on October 31, 2014, 06:21:08 pm
34/40 and a fantastic 5/9 in Graphs  8)
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 06:23:07 pm
(I may be wrong here...)
two heights = 6 and 9
9/6 = 1.5 = k
k^2 (because area) = 2.25
2.25x = 180
x = 80
The height of the second cone is 15, you need to add the two together.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: brenden on October 31, 2014, 06:28:56 pm
Can someone with a CAS confirm the Business question 9 is D? Someone on Facebook reckons it's E, there's a really minimal difference between the answers (CAS is at my Dad's house :'( )
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: NamasteLjubo on October 31, 2014, 06:29:13 pm
Question 9 for Business is E not D.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: jamespala on October 31, 2014, 06:29:20 pm
Damn :( well thank you for the correction :)

Thank you :) still i've lost 4 stupid marks hahaha hopefully study score of atleast 40 is still in reach
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: brenden on October 31, 2014, 06:30:09 pm
Thank you :) still i've lost 4 stupid marks hahaha hopefully study score of atleast 40 is still in reach
Definitely still within reach.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: spectroscopy on October 31, 2014, 06:32:04 pm
is the OP being edited to keep up with errors?(if there are any)
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: vcestudent123 on October 31, 2014, 06:33:01 pm
I also don't understand how question 6 is A. The third quartile (37th dot) is clearly located above ~46-47 ish, and E is the only answer that reflects this.
I graphed it on my calc and it displayed Box plot similar to E.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: aejays on October 31, 2014, 06:33:44 pm
I got all the same for Core, Geo & Trig, Graphs and Matrices.

BUT. When I checked with a friend, he got all the same as me except question 5 in graphs about the average speed of the train.
So what he did was find the average of the two periods of time the train was actually moving, and excluded the time it stopped, so he got D (65) as the answer. I took "the average speed of the train...for the journey" to mean for the whole journey and ended up with A (45). What about you guys?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: cambo6torres on October 31, 2014, 06:34:11 pm
pretty sure question 9 in bus math is E because you forgot to add interest the last payment. I wrote D but im pretty sure that's wrong.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: Dan1995 on October 31, 2014, 06:34:29 pm
is the OP being edited to keep up with errors?(if there are any)
I've updated the core, trig, networks and matrices module as the answers are confirmed and discussed, the moderators have been changing the other modules as necessary.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: aejays on October 31, 2014, 06:38:41 pm
I also don't understand how question 6 is A. The third quartile (37th dot) is clearly located above ~46-47 ish, and E is the only answer that reflects this.

You have to find the IQR of the data (20) and find the upper fence = 50 + 1.5 x 20 = 80. So there were actually only 2 outliers.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: vididid on October 31, 2014, 06:39:24 pm
lost eight :'(
35+ still possible ?!!
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: brenden on October 31, 2014, 06:39:46 pm
lost eight :'(
35+ still possible ?!!
Definitely!
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: vcestudent123 on October 31, 2014, 06:40:22 pm
lost eight :'(
35+ still possible ?!!
You still have Exam 2, so definitely possible.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: brenden on October 31, 2014, 06:42:16 pm
So is there pretty much absolute consensus now? (haven't been following the thread or updates)
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Addzkebabs on October 31, 2014, 06:42:45 pm
Hey guys,

Can someone please verify and explain why number patterns question 7 is C? Made a few really bad mistakes and am on the verge of tears haha bye bye 45+  :'( :'( :'( :'( :'( :'(

Cheers
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: vididid on October 31, 2014, 06:42:55 pm
how much would i need to get on exam two to get at least above a 36-37?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Chloe11 on October 31, 2014, 06:44:04 pm
For the Core isn't the answer to question 12 C? Because the index is 1.25
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: vcestudent123 on October 31, 2014, 06:45:37 pm
Hey guys,

Can someone please verify and explain why number patterns question 7 is C? Made a few really bad mistakes and am on the verge of tears haha bye bye 45+  :'( :'( :'( :'( :'( :'(

Cheers

What I did was instead of p and q

I replaced them with numbers, so for example 1 and 2..

Found 4th and 5th term and found the difference, which was p +q
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: IntelxD on October 31, 2014, 06:47:08 pm
For the Core isn't the answer to question 12 C? Because the index is 1.25

No. You can refer to VCAA-2011 exam 1 q12. It is the same question with different values.

Here is the examiners report.

http://www.vcaa.vic.edu.au/Documents/exams/mathematics/further1_assessrep_11.pdf
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Addzkebabs on October 31, 2014, 06:47:22 pm
What I did was instead of p and q

I replaced them with numbers, so for example 1 and 2..

Found 4th and 5th term and found the difference, which was p +q

Genius haha, thanks for that  ;D
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: soysauce on October 31, 2014, 06:47:35 pm
Quote
Can someone please verify and explain why number patterns question 7 is C?

t1 = p
t2 = q
t3 = t1 + t2 = p + q
t4 = t3 + t2 = p + q + q = p + 2q
t5 = t4 + t3 = p + 2q + p + q = 2p + 3q

Difference between t4 and t5:
t5 - t4 = 2p + 3q - (p + 2q) = p + q
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: vcestudent123 on October 31, 2014, 06:48:19 pm
For the Core isn't the answer to question 12 C? Because the index is 1.25
Sadly, no :/
It was honestly an extremely unfair question.

Check out Further math Exam 1 2011 Core: Q12 answers on VCAA.

It was near identical to the one we had this year.

Pretty much what you had to do was.. rearrange seasonal index formula, so it calculates for deseasonalised.

Then on the calculator I did solve (x/1.25 = kx, k)
(x = actual sales)
k= 0.8
1-0.8 = 0.2
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: nugz on October 31, 2014, 06:51:15 pm
Can someone please explain to me why question 11 core is E? I thought to find the deseasonalised value you have to divide the actual figure by the seasonal index?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 06:51:33 pm
Sadly, no :/
It was honestly an extremely unfair question.

Check out Further math Exam 1 2011 Core: Q12 answers on VCAA.

It was near identical to the one we had this year.
Sorry but I don't think it's that unfair, anyone who had done the previous VCAA exams as revision and checked the answers they werent sure about or got wrong would've known how to answer that question. Hopefully your teacher recommended you do that as preparation for the exam?
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: JohnH18 on October 31, 2014, 06:51:43 pm
Cool  :)
That Question 6 though, that was really unfair for this year, but, I do think it's A cause of the CAS.

Took me a bit but i thought it was simple once you figure out what to do, you know the median and Q3, calculate the upper fence and done
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 06:52:49 pm
Can someone please explain to me why question 11 core is E? I thought to find the deseasonalised value you have to divide the actual figure by the seasonal index?
That is correct, did you use the correct SI for May, or did you use the one you found in the question above, for December?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: soysauce on October 31, 2014, 06:52:53 pm
Sitting on 31/40
What study score am I looking at if I get 95+ on exam 2?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: vcestudent123 on October 31, 2014, 06:53:03 pm
Sorry but I don't think it's that unfair, anyone who had done the previous VCAA exams as revision and checked the answers they werent sure about or got wrong would've known how to answer that question. Hopefully your teacher recommended you do that as preparation for the exam?

Of course, all teachers recommend that.
I did the revision myself and that's how I got the right answer for that question.

My point is that only 10% of the whole state had the right answer that year, why use it again?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 06:55:05 pm
Of course, all teachers recommend that.
I did the revision myself and that's how I got the right answer for that question.

My point is that only 10% of the whole state had the right answer that year, why use it again?
They need questions like that occasionally to differentiate between students? And given that it was on a recent exam, hopefully most students were shown how to do that question in class, as it was done so poorly.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: LiquidPaperz on October 31, 2014, 06:55:38 pm
bloody misread core q13 and graphs q7 so pissed!!!!!!!
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: vcestudent123 on October 31, 2014, 06:56:10 pm
They need questions like that occasionally to differentiate between students? And given that it was on a recent exam, hopefully most students were shown how to do that question in class, as it was done so poorly.
I suppose you are right about that.
There will always be a question like that every year I guess.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: nugz on October 31, 2014, 06:57:12 pm
That is correct, did you use the correct SI for May, or did you use the one you found in the question above, for December?

Oh wow. I feel so stupid. I used the March SI :( :( And I even double checked everything!
I guess that's what the pressure of an exam does to me  >:(
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: clidedescope on October 31, 2014, 06:57:38 pm
Of course, all teachers recommend that.
I did the revision myself and that's how I got the right answer for that question.

My point is that only 10% of the whole state had the right answer that year, why use it again?

Given that not many students got it correct in the previous year, it actually means they're more likely to use it again. It's because they need to make sure it's being taught. Most teachers check the examiners report and note the tricky areas.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Addzkebabs on October 31, 2014, 06:59:27 pm
Took me a bit but i thought it was simple once you figure out what to do, you know the median and Q3, calculate the upper fence and done

Hey guys,

Sorry to ask again and bust everyones balls but for question 6 in core, how did everyone know Q3? I still believe it was E... Lmao unless I'm completely retarded  :o

Cheers
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: soysauce on October 31, 2014, 07:00:11 pm
Hey guys,

Sorry to ask again and bust everyones balls but for question 6 in core, how did everyone know Q3? I still believe it was E... Lmao unless I'm completely retarded  :o

Cheers

+1
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 07:00:33 pm
I suppose you are right about that.
There will always be a question like that every year I guess.
At least it was in core, as it is the only compulsory module, I would be expecting a much higher percentage of correct answers for that question this year, which would mean that students are being taught to the exams, which is a good thing. The range of questions that can be asked is also somewhat limited for core, so most of the questions are just modified versions of older questions, just some of them probably date back before 2006.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Monodon monoceros on October 31, 2014, 07:00:49 pm
Networks question 7, are you sure the answer is E? I spoke to my teacher after and they said it was C....
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: phlman on October 31, 2014, 07:01:46 pm
Networks questions 9? is it really C?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: nugz on October 31, 2014, 07:02:35 pm
I thought networks question 7 was D. I can't seem to redraw the first graph as planar. Can someone post a picture of how they did the first graph as planar?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 07:02:57 pm
Hey guys,

Sorry to ask again and bust everyones balls but for question 6 in core, how did everyone know Q3? I still believe it was E... Lmao unless I'm completely retarded  :o

Cheers
q3 is the 38th point, which was 50. So when you do the calculation for the upper fence (max value before it becomes an outlier) you do 50+1.5x(50-30)=80, therefore anything above 80 is an outlier, which was only two values.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 07:04:39 pm
Networks questions 9? is it really C?
My solutions say D?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Monodon monoceros on October 31, 2014, 07:05:15 pm
I could't redraw the 2nd graph or the first graph
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: IntelxD on October 31, 2014, 07:05:27 pm
q3 is the 38th point, which was 50. So when you do the calculation for the upper fence (max value before it becomes an outlier) you do 50+1.5x(50-30)=80, therefore anything above 80 is an outlier, which was only two values.

Yeah, there was no need to use the CAS. The key to answering the question was to determine the number of outliers.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 07:05:59 pm
I thought networks question 7 was D. I can't seem to redraw the first graph as planar. Can someone post a picture of how they did the first graph as planar?
Take the bottom vertice to the very top, and then redraw the edge from the top right vertice to the bottom left so that it goes around the bottom right?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: phlman on October 31, 2014, 07:06:24 pm
My solutions say D?
OH , sorry my bad i read it wrong, can you please show me how you got D?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 07:07:12 pm
I could't redraw the 2nd graph or the first graph
1st one. Take the very bottom  vertice up to the top so its above the top two, then if you redraw the edge from the top right to the bottom left it becomes planar.
2nd one. Swap the bottom left vertice with the place of the bottom right, and redraw the edge between them so it goes around the other vertices, and it becomes planar.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Lucho23 on October 31, 2014, 07:07:47 pm
Hey guys,

Sorry to ask again and bust everyones balls but for question 6 in core, how did everyone know Q3? I still believe it was E... Lmao unless I'm completely retarded  :o

Cheers
With Box Plots remember, 25% is below the Q1, 25% between Q1 and Median, 25% between Median and Q3 and 25% above Q3.
With this in mind, you can use the Q3+IQRx01.5 rule to find the upper fence, at which point, any data point greater than or equal to this is an outlier.
This requires a little bit off rough estimating, so Q1 is 25% of 50; Q1 = 12.5. Q3 is 75% of 50; Q3 = 37.5.
Count through and find the 12.5th point and the 37.5th point. They seem to be approximately 29 and 49, respectively.
This means the IQR = 20. Use the rule: Q3+IQRx01.5 so now 49+20x1.5 = 79.
Only two data points lie above 79, therefore, A is the correct option.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 07:08:31 pm
OH , sorry my bad i read it wrong, can you please show me how you got D?
A and B are not cuts as they do not completely separate the source from the sink.
C has a capacity of 20.
D has a capacity of 18 (as the 4 is not counted).
E has a capacity of 22.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: jaketsorlinis1 on October 31, 2014, 07:09:01 pm
Anybody able to explain why Q9 from number patterns is D when C clearly works. after about 20 days 500 grams are in her body and 200 which is 40 percent is being removed each day. C said less than 200 is the max from each 24 hour peroid therefore it is not true and is what they were asking for
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: nugz on October 31, 2014, 07:10:38 pm
Take the bottom vertice to the very top, and then redraw the edge from the top right vertice to the bottom left so that it goes around the bottom right?

I see it now, thanks.
I'm quite disappointed with 37/40, especially when I got full marks when I did the 2013 one :(
Do I still have a chance of like mid-40s if I get an A+ for Exam 2?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 07:11:53 pm
I see it now, thanks.
I'm quite disappointed with 37/40, especially when I got full marks when I did the 2013 one :(
Do I still have a chance of like mid-40s if I get an A+ for Exam 2?

Yes, it is possible to get 45+ still, depending on your ranking in the cohort and the strength of the cohort, and what range A+ you get (whether you just scrape in with an A+ or a clear of the cutoff by a few marks).
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Addzkebabs on October 31, 2014, 07:12:32 pm
With Box Plots remember, 25% is below the Q1, 25% between Q1 and Median, 25% between Median and Q3 and 25% above Q3.
With this in mind, you can use the Q3+IQRx01.5 rule to find the upper fence, at which point, any data point greater than or equal to this is an outlier.
This requires a little bit off rough estimating, so Q1 is 25% of 50; Q1 = 12.5. Q3 is 75% of 50; Q3 = 37.5.
Count through and find the 12.5th point and the 37.5th point. They seem to be approximately 29 and 49, respectively.
This means the IQR = 20. Use the rule: Q3+IQRx01.5 so now 49+20x1.5 = 79.
Only two data points lie above 79, therefore, A is the correct option.

Thanks Dan1995 and Lucho23 for the clarification, turns out I just am retarded  :o Thanks again guys, sorry to be a pain :)
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Lucho23 on October 31, 2014, 07:12:54 pm
Anybody able to explain why Q9 from number patterns is D when C clearly works. after about 20 days 500 grams are in her body and 200 which is 40 percent is being removed each day. C said less than 200 is the max from each 24 hour peroid therefore it is not true and is what they were asking for
Option C is true, actually.
Try this: Chuck the sequence in a column on a spreadsheets page. In the column next to the sequence, multiple each Dn value by 0.4 (=a1*0.4 and drag this for all cells).
This never reaches 200, therefore showing that the amount leaving her body is always below 200.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 07:13:23 pm
Thanks Dan1995 and Lucho23 for the clarification, turns out I just am retarded  :o Thanks again guys, sorry to be a pain :)
Don't stress, still plenty of marks to make up on exam 2.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: phlman on October 31, 2014, 07:13:31 pm
A and B are not cuts as they do not completely separate the source from the sink.
C has a capacity of 20.
D has a capacity of 18 (as the 4 is not counted).
E has a capacity of 22.
darn! i forgot that maximum flow = minimum cut , sigh lost two marks. Thanks anyway!
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: connie990 on October 31, 2014, 07:15:14 pm
Are we sure that question 13 core is option C ??? Cause thats what I did and I don't want it to be wrong!
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Lucho23 on October 31, 2014, 07:15:39 pm
Thanks Dan1995 and Lucho23 for the clarification, turns out I just am retarded  :o Thanks again guys, sorry to be a pain :)
No problem  :) Make sure you ask, or else you'll keep making the same mistakes.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: vcestudent123 on October 31, 2014, 07:16:17 pm
To anyone else who got E.. Check if you forgot to count the outliers at the end as points, the 3rd quartile should actually be 50, not 47

Definitely wearing glasses to my future exams -.-
"n=50"
My calculator has 46 numbers... I think I'll wear my glasses next time as well haha
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: nugz on October 31, 2014, 07:17:16 pm
I see it now, thanks.
I'm quite disappointed with 37/40, especially when I got full marks when I did the 2013 one :(
Do I still have a chance of like mid-40s if I get an A+ for Exam 2?

Thank you, I'll try redeem myself in Exam 2 
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: joannesbitx on October 31, 2014, 07:18:18 pm
how is if possible for there to be any planar graphs in the networks question 7?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 07:18:41 pm
Are we sure that question 13 core is option C ??? Cause thats what I did and I don't want it to be wrong!
The gradient is unchanged, so the answer is C.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 07:19:13 pm
how is if possible for there to be any planar graphs in the networks question 7?
Because you have to redraw them. All 4 can be rearranged and moved to become planar.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: nugz on October 31, 2014, 07:19:16 pm
how is if possible for there to be any planar graphs in the networks question 7?

You have to redraw them to make it planar
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: clidedescope on October 31, 2014, 07:19:51 pm
Does anybody know how reliable the business maths solutions are? Because I know there's been a bit of debate over it, I'd prefer to know if there's any other questions (besides 9, though it is E) that are uncertain before I feel confident in my mark :P
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: vcestudent123 on October 31, 2014, 07:20:45 pm
I almost forgot..
Thanks for the solutions guys :) It made me realise how much I need to start paying attention to the questions and not just assume things before finishing them.

Exam 2 will definitely be better than Exam 1 (hopefully)
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: nugz on October 31, 2014, 07:22:27 pm
Did anyone else find this year harder than recent years?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: IntelxD on October 31, 2014, 07:24:47 pm
Did anyone else find this year harder than recent years?

I felt it was relatively on par with the previous years exams.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Lucho23 on October 31, 2014, 07:26:01 pm
Did anyone else find this year harder than recent years?
After going through all of the questions again, I felt that, as always, there were odd questions, but they were a bit more manageable this time around.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: nugz on October 31, 2014, 07:29:44 pm
I felt it was relatively on par with the previous years exams.
After going through all of the questions again, I felt that, as always, there were odd questions, but they were a bit more manageable this time around.

So you guys think that the cut off for A+ will be 37 again? Some years it has been 36
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Manolya.i on October 31, 2014, 07:31:20 pm
Proposed answers are below! If you feel like something is incorrect, post what you think it is and why and if you're right, we'll change the original thread :)

Core.
1. B
2. D
3. C
4. D
5. B
6. A
7. C
8. E
9. B
10. E
11. E
12. A
13. C

Number Patterns
Spoiler
1. A
2. C
3. D
4. E
5. B
6. E
7. C
8. B
9. D

Geometry and Trigonometry
Spoiler
1. B
2. C
3. D
4. C
5. D
6. E
7. A
8. B
9. D

Graphs and Relations
Spoiler
1. B
2. E
3. D
4. B
5. A
6. D
7. B
8. B
9. C

Business-related Mathematics
Spoiler
1. D
2. C
3. C
4. E
5. C
6. D
7. B
8. D
9. E

Networks
Spoiler
1. D
2. D
3. C
4. A
5. A
6. B
7. E
8. E
9. D

Matrices.
Spoiler
1. A
2. B
3. B
4. C
5. C
6. E
7. D
8. E
9. C

Good luck with exam 2 everyone!


wouldn't question 2 be C? for matrices:/ doesnt make sense
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: DanielJ on October 31, 2014, 07:32:42 pm

wouldn't question 2 be C? for matrices:/ doesnt make sense

Left matrix is a 3*2, right is 3*1. Can't multiply them
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: IntelxD on October 31, 2014, 07:33:03 pm
So you guys think that the cut off for A+ will be 37 again? Some years it has been 36

Honestly it's very difficult to predict what the cut off will be for further exams, specifically exam 1. I believe it will be 37 again however I wouldn't be surprised if it were 36.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: nugz on October 31, 2014, 07:34:22 pm
Honestly it's very difficult to predict what the cut off will be for further exams, specifically exam 1. I believe it will be 37 again however for I wouldn't be surprised if it were 36.

Mmm yeah I agree. Also hard to predict how well you'll go considering it's so competitive!
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: DanielJ on October 31, 2014, 07:35:46 pm
Honestly it's very difficult to predict what the cut off will be for further exams, specifically exam 1. I believe it will be 37 again however for I wouldn't be surprised if it were 36.

Average since 2006 has been 36.57. So it can go either way.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: SarahLoria on October 31, 2014, 07:37:03 pm
Is anyone able to scan their copy of the exam through? I don't have mine with me and it would be great to check answers
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: soysauce on October 31, 2014, 07:38:41 pm
Is anyone able to scan their copy of the exam through? I don't have mine with me and it would be great to check answers

https://drive.google.com/folderview?id=0ByQLc1BiRWP1cUE1ZWlQa0NBVWs&usp=sharing
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Manolya.i on October 31, 2014, 07:39:31 pm
okay so I'm not really good at further, and i just want to get an average mark possibly 20, what do you reckon my exam mark needs to be?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: QTPi on October 31, 2014, 07:39:55 pm
Can someone please explain why Q9 for Buisness is E and not D?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: demand&supply on October 31, 2014, 07:41:21 pm
thanks for the solution  ;D
but just to make sure, is question 9 on Business Module 100% E? cos a lot of ppl had D and its confusing me.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: demand&supply on October 31, 2014, 07:43:57 pm
Can someone please explain why Q9 for Buisness is E and not D?

I got E and this is my reason. After the 47th payment, you still owe $802.39 and need to repay it. But by the 48th payment, you have to repay that and the interest added on that reduced balance, hence $805.57 (E). Thats how I see it, hope someone smarter than me can explaining it better  :)
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: clidedescope on October 31, 2014, 07:46:15 pm
Did anyone else find this year harder than recent years?

I did, but I think it was partially due to the stress of actually being in my exam, you know? There's not nearly as much pressure in practise exams.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: clidedescope on October 31, 2014, 07:48:50 pm
I got E and this is my reason. After the 47th payment, you still owe $802.39 and need to repay it. But by the 48th payment, you have to repay that and the interest added on that reduced balance, hence $805.57 (E). Thats how I see it, hope someone smarter than me can explaining it better  :)

You explained it perfectly. If you chose D, then you would have been ignoring the added interest for that month's repayment. E added it, so it was correct.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: AngelWings on October 31, 2014, 07:53:51 pm
Option C is true, actually.
Try this: Chuck the sequence in a column on a spreadsheets page. In the column next to the sequence, multiple each Dn value by 0.4 (=a1*0.4 and drag this for all cells).
This never reaches 200, therefore showing that the amount leaving her body is always below 200.

Yes, my annotations say likewise. Using the equation: r would have to be equal to or greater than 1, in order for that to be NOT true, as the question states.

Are we sure that question 13 core is option C ??? Cause thats what I did and I don't want it to be wrong!

Spoiler
Using our lovely Core Module friend, the gradient formula: m= rise/ run
There are 16 points, as stated above and by counting like a Prep student. Dividing this into its 3 sections, as the three median method requires, we have 5 points on the left and right sections, 6 in the middle section.
The gradient comes from the left and right medians. Their coordinates work out to be roughly (3,8) and (14,8).
Taking the gradient of that, it's 0.
Thus, my answer is C.

@ nugz: Dumb mistakes = Why Further? Whyyyyyy?
Overall, did better than my practice exams (because they too were dumb mistakes), which counts for something.

okay so I'm not really good at further, and i just want to get an average mark possibly 20, what do you reckon my exam mark needs to be?
Not sure. By using this: http://www.vcaa.vic.edu.au/Documents/statistics/2013/section3/vce_further_mathematics_ga13.pdf
I would assume about 13-14 questions correct?
Sorry, my estimations are horrible.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: soysauce on October 31, 2014, 07:54:08 pm
Anyone able to explain trig q6 please?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: AngelWings on October 31, 2014, 07:58:09 pm
Anyone able to explain trig q6 please?

Sure, Soysauce.
Try the cosine rule and add the 140 degrees that's there.
I'll explain it better in a minute. Just give me the okay.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: chickadee on October 31, 2014, 07:58:32 pm
Can someone please explain Question 8 in Number patterns is B and not A?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: RipeBanana on October 31, 2014, 08:00:02 pm
can anyone explain Q 7 on Networks.
Why is it E? isn't the one on the very left the only graph that is planar????
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: soysauce on October 31, 2014, 08:01:44 pm
Can someone please explain Question 8 in Number patterns is B and not A?

Can't be A because straight line = arithmetic
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: aejays on October 31, 2014, 08:02:44 pm
Hey sorry to ask again, but what did everyone get for Graphs & Relations question 5?

When I checked with a friend, he got all the same as me except question 5 in graphs about the average speed of the train.
What he did was find the average of the two periods of time the train was actually moving, and excluded the time it stopped, so he got D (65) as the answer.
I took "the average speed of the train...for the journey" to mean for the whole journey and ended up with A (45).
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Lucho23 on October 31, 2014, 08:05:48 pm
Hey sorry to ask again, but what did everyone get for Graphs & Relations question 5?

When I checked with a friend, he got all the same as me except question 5 in graphs about the average speed of the train.
What he did was find the average of the two periods of time the train was actually moving, and excluded the time it stopped, so he got D (65) as the answer.
I took "the average speed of the train...for the journey" to mean for the whole journey and ended up with A (45).
You're correct :) Unfortunately, your friend didn't get it correct because the average time includes the stationary time.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: LiquidPaperz on October 31, 2014, 08:06:42 pm
how many stupid mistakes did people make?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: soysauce on October 31, 2014, 08:08:30 pm
how many stupid mistakes did people make?

too many..............
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: vididid on October 31, 2014, 08:09:26 pm
how many stupid mistakes did people make?

so many, I had 4 questions where i had the right answer and having finished 10 minutes early felt the need to over think like a retard and changed them ugh... but the other 4 were actual errors :'(
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: doomdestroyer on October 31, 2014, 08:10:21 pm
how many stupid mistakes did people make?

Too many, i always do that for Maths, not one of my strongest subjects.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: _mariiam on October 31, 2014, 08:10:55 pm
Hey everyone

My friend got a B on further today but shes rank one
Will she still get a 40 or above??!!!??
(she's not on Facebook so she asked me to ask for her)
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: AngelWings on October 31, 2014, 08:12:08 pm
Can someone please explain Question 8 in Number patterns is B and not A?

Note that it uses AC and that you already have a pair of similar sides: 40.4m from BC and 10m from BD.
After that, use the SF concept: SF= BC/BD=AC/DE
Where did we get DE, you ask?
Spoiler
You use Pythagoras' theorem! So...
DE2 = 122- 102
DE=square root of 44
After finding DE, you know want to find the distance AC.
Use the SF concept
Spoiler
So...
BC/BD=AC/DE
where BC=40.4m , BD=10m, DE= square root of 44 (also metres) ~ we worked this out before.
therefore: 40.4/10=x/sqrt (44)
x=sqrt of 44 x 4.04 = 26.7983 (4dp.) = 26.8
This gives B.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: clidedescope on October 31, 2014, 08:15:11 pm
Hey everyone

My friend got a B on further today but shes rank one
Will she still get a 40 or above??!!!??
(she's not on Facebook so she asked me to ask for her)

If she got a B on the second exam, I don't think she would. SAC marks are only 33% of your score, so it makes your exam performance crucial to get a good mark, even though she is ranked first.
I can't say for sure, but I think she'd need an A+ in exam 2 to get in the 40s.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Stew_822 on October 31, 2014, 08:21:50 pm
I'm not sure about question 4 in Geometry and Trig. How did you guys get C? I can't even replicate it.

I got A by doing tan (23) = opposite over 150, because there was 150m difference between the heights of the two points and we are looking for the horizontal (not straight-line) distance. You draw the triangle and work it out.... right.... c'mon guys please.. don't let me lose another mark here :/
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 08:26:07 pm
I'm not sure about question 4 in Geometry and Trig. How did you guys get C? I can't even replicate it.

I got A by doing tan (23) = opposite over 150, because there was 150m difference between the heights of the two points and we are looking for the horizontal (not straight-line) distance. You draw the triangle and work it out.... right.... c'mon guys please.. don't let me lose another mark here :/

You needed to do tan (67) as the angle inside the triangle is 90-23
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: soysauce on October 31, 2014, 08:26:47 pm
I'm not sure about question 4 in Geometry and Trig. How did you guys get C?

Angle of depression = 23
90 - 23 = 67

Now make a right angle triangle, height = 150, length = ?, angle between height and hypotenuse = 67
tan(67) = x/150
x = 150 * tan(67)
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Stew_822 on October 31, 2014, 08:29:55 pm
FRICK FRICK FRICK FRICK FRICK FRICK FRICK FRICK....

hot damn that's annoying.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Swiggy on October 31, 2014, 08:30:53 pm
Got 5 wrong, still a chance for a 40+ ? Also had an 88% SAC average
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Cesc Fabregas on October 31, 2014, 08:34:22 pm
Hey Guys I got 36/40 for this exam and have a 92% average? Will I be able to scrape a 40? and what would I need? And if not, what is the max I can probably get and what score would I need on Exam 2?

Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Cesc Fabregas on October 31, 2014, 08:37:02 pm
Hey guys I just sat the exam today and got 36/40. I have a 92 average, and what exam 2 score ill I need to get a 40? (if it is still possible) If not what is maximum score that I can get and what score would I need for it in exam 2? Thanks
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: brenden on October 31, 2014, 08:38:11 pm
To anyone asking if they can still get a 40 if they lost 4 or 5 marks: Yes, but do well on Exam 2. Lol.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: doher109 on October 31, 2014, 08:38:56 pm
Hi everyone,

Today at a school my friends did the further exam (obviously)

There were 2 classes. One had the correct time, the other had 15 minutes extra due to a clock error.

The chief examiner walked in and stopped it. And ideas what will happen? 15 minutes extra on a 90 minute exam is quite major don't you all think?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: AngelWings on October 31, 2014, 08:43:10 pm
Anyone able to explain trig q6 please?
Sure, Soysauce.
Try the cosine rule and add the 140 degrees that's there.
I'll explain it better in a minute. Just give me the okay.
Step 1a: Note that the question's looking for "Point C from A"
Step 1b. (Optional): Instantly eliminate options A and B. A bearing cannot be any smaller than 140 degrees if they've told you B is 140 degrees already. Reminder that you are going from the North and finding the true bearing. This should be obvious, seeing as none of the options have a direction attached to them.
Step 2a: Rearrange the cosine rule so you can have angle A (or angle CAB, BAC, whatever you call it as long as it's the same one).
Spoiler
Okay, so the cosine rule rearranged will look something like this:
angle A=cos-1((b2+c2-a2)/2bc)
Step 2b.: Use it by substituting the values of b, c and a (the side lengths). Make sure you put in the right ones into the right spots. If you have problems with this, try to label them properly i.e. side b is opposite angle B and so forth.
Spoiler
VCAA decided to use the formula I've just stated. How convenient of them, right?
Therefore:
angle A=cos-1((19002+20502-22502)/2 x 1900 x 2050)
            =cos-1(275/779)
            =69.3281 degrees(4 decimal places)
Step 3: Hey, we seem to have forgotten something, right?
Spoiler
Simple answer - yes, yes, we definitely have. Some people would have completely forgotten this and, having not crossed out A or B already, would assume it's B... but it's not.
Why?
Spoiler
We've missed our other titbit of information: that 140 degrees.
So, "What's the real answer?" you say with impatience.
Spoiler
We simply have to add them together,
i.e. 140 + 69.3281 = 209.3281 (4 d.p.)
which rounds down to 209 degrees, our closest answer.
It just so happens that this is answer E.
And that, Soysauce, is how we get our answer!
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: harveyconnor on October 31, 2014, 08:44:29 pm
Networks Q7, answer should be A
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Cesc Fabregas on October 31, 2014, 08:57:24 pm
Hey guys I just say the examination today for exam 1. I got 36/40 will I still be able to get a 40 raw, I have a 92% sac average and if so what would I need on exam 2 to get this score?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: RipeBanana on October 31, 2014, 09:00:43 pm
anyone explain Q 7 on networks?? please
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Lucho23 on October 31, 2014, 09:02:22 pm
Hey guys I just say the examination today for exam 1. I got 36/40 will I still be able to get a 40 raw, I have a 92% sac average and if so what would I need on exam 2 to get this score?
Ask OutstandingInDivination: asdfmovie
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: jezzacarlton on October 31, 2014, 09:03:49 pm
Hey guys I just say the examination today for exam 1. I got 36/40 will I still be able to get a 40 raw, I have a 92% sac average and if so what would I need on exam 2 to get this score?

Yes you can, following the grade boundaries for study scores last year you will need to get 54+ out of 60 to get a raw 40
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Lucho23 on October 31, 2014, 09:07:11 pm
Hey guys I just say the examination today for exam 1. I got 36/40 will I still be able to get a 40 raw, I have a 92% sac average and if so what would I need on exam 2 to get this score?
My friend got 96-97% SAC average and was ranked in top 5. She lost about 6-7 marks on Exam 1 and then 1 on Exam 2. She got a 43. Anything is possible, you just need to stop worrying about an 'achievable score' and go for the perfect score! SS is unpredictable, that's why no one can properly guess them! Just give it your all (I know that's generic but I wanted to know my SS so bad as well but realised all that worrying was wasted). Hope Exam 2 goes well! :)
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: FER0058 on October 31, 2014, 09:17:56 pm
Hey the guy who posted the answers,

How can the answer for question 6 in matrices be C if the order of X is 3x2?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: doomdestroyer on October 31, 2014, 09:21:04 pm
Hey the guy who posted the answers,

How can the answer for question 6 in matrices be C if the order of X is 3x2?

It says that the answer is E dude.
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: clidedescope on October 31, 2014, 09:21:48 pm
Hey the guy who posted the answers,

How can the answer for question 6 in matrices be C if the order of X is 3x2?

Unless I'm missing something here, the OP says that the answer IS E...
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 09:27:20 pm
Hey the guy who posted the answers,

How can the answer for question 6 in matrices be C if the order of X is 3x2?
Hey the guy who asked a question without reading the post properly, the listed answer was not C.
Your's truly, the guy who posted the answers.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: davidneitz09 on October 31, 2014, 09:41:22 pm
So if I averaged 95% on SACS, ranked 4th, I only got 36/40 on exam 1, what if I get about 57/60 on Exam 2, what range study score am I looking at? thanks!
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Kayleejohns on October 31, 2014, 09:43:41 pm
Hello could anyone explain how question 9 of Networks is D? I had B, not sure how it could be D? Thanks!!
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: FER0058 on October 31, 2014, 09:43:57 pm
Hey the guy who asked a question without reading the post properly, the listed answer was not C.
Your's truly, the guy who posted the answers.



sorry dude didnt see tht. btw i got 35/45 for ex1 and hoping to get 60/60 for ex2 and i got 95/100 for sacs. what SS will i be achieving at this stage
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: jamesarshid on October 31, 2014, 09:44:52 pm
34/40 on that exam with 98/100 in my SAC marks, what are my chances of a 40?
Title: Re: 2014 Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 09:49:01 pm


sorry dude didnt see tht. btw i got 35/45 for ex1 and hoping to get 60/60 for ex2 and i got 95/100 for sacs. what SS will i be achieving at this stage

All good, I'd say low-mid 40s.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: davidneitz09 on October 31, 2014, 09:49:17 pm
Hello could anyone explain how question 9 of Networks is D? I had B, not sure how it could be D? Thanks!!
Cut D has the edge of 4 which goes back from Sink to Source, therefore it is not counted making it 18
Cuts A & B are discounted because they do not cut through both carparks!
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: clidedescope on October 31, 2014, 09:50:32 pm
For all future study score estimation requests: http://www.atarnotes.com/forum/index.php?topic=138592.0

Apparently, this is a pretty accurate way to do it. I'm doubtful that the cut-off for an A+ in exam 1 this year will be any higher than 37/40 - from my knowledge, that's the highest it's ever been.
But really, try not to focus on predictions and instead think towards the exam on Monday that also contributes to your study score.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: kevleee on October 31, 2014, 09:51:28 pm
Hello could anyone explain how question 9 of Networks is D? I had B, not sure how it could be D? Thanks!!
Cut A and Cut B are immediately disregarded as it does not stop the flow from both car parks to the exit.
The capacity of:
Cut C = 20 (5+12+3)
Cut D = 18 (5+10+3)
Cut E = 22 (5+11+6)
Therefore, the minimum cut and thus maximum flow is Cut D.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 09:52:27 pm
Hello could anyone explain how question 9 of Networks is D? I had B, not sure how it could be D? Thanks!!
I explained that question in detail in an earlier post :)
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Kayleejohns on October 31, 2014, 09:54:10 pm
Oh, thanks everyone, I hadn't even noticed the other car park until now, woops
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: leajasmine on October 31, 2014, 10:12:55 pm
I don"t understand how Q2 in business maths is C? I got A. Can someone please explain how they worked that out? Thanks in advance :)
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: QTPi on October 31, 2014, 10:25:43 pm
I don"t understand how Q2 in business maths is C? I got A. Can someone please explain how they worked that out? Thanks in advance :)

So you were pretty much half way there with the answer, i'm assuming you did 120 divide by 15000 which was 0.008 (A) however the question asked as a percentage so then you would need to multiply it by 100 to get 0.80% (C) I hope that helps  :)
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on October 31, 2014, 10:34:16 pm
I got E for Q5 in core
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 10:34:48 pm
I got E for Q5 in core
Mind explaining how?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: kevleee on October 31, 2014, 10:36:24 pm
I got E for Q5 in core

I'm assuming you counted the total number of female drivers?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on October 31, 2014, 10:38:10 pm
Copy of the exam anyone?! :)
Why it is not cut B
I explained that question in detail in an earlier post :)
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 10:40:00 pm
Why it is not cut B
B doesnt separate the sink from the source completely, you could still go from the top car park to the exit.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: kevleee on October 31, 2014, 10:40:54 pm
Why it is not cut B

Because it doesn't stop the flow from both car parks to the exit.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on October 31, 2014, 10:41:04 pm
Oh.no. I get it.  Now
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on October 31, 2014, 10:42:02 pm
Why Q6 not e in core
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: QTPi on October 31, 2014, 10:45:11 pm
Why Q6 not e in core

Only 90 and 100 were outliers therefore A is the only possible answer
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 10:46:04 pm
Why Q6 not e in core
These have already been explained in earlier posts, but it's because E incorrectly shows that the value at approximately 74 was an outlier, whereas the only values that are outliers (according to Q3+1.5xIQR) are those values over 80. So the answer is A.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Scrono13 on October 31, 2014, 10:47:41 pm
Q 8 number patterns? Why not A?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Durango on October 31, 2014, 10:49:58 pm
In question 9 for number patterns, couldn't it also be C?

having to say which isn't true, D is a more obvious answer, but with C it states "The number of milligrams of medicine that leaves Sam's body during any 24 hour period will always be less than 200."

now, this would be true if it had said "less than or equal to" because the most milligrams that can leave Sam's body, in the given equation is = to 200

200 exceeds <200
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on October 31, 2014, 10:50:20 pm
Q8 why it's not A in core
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Durango on October 31, 2014, 10:51:31 pm
Q 8 number patterns? Why not A?

This is a geometric sequence, so the graph will have a curving pattern to it
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 10:52:16 pm
Q8 why it's not A in core
Mate, these questions have all been explained in detail in earlier posts?

But it's because you need a numerical and two categorical variables for a back to back stemplot, you have been given the numerical and then the only option that gives two categorical variables is E (Male and female). Option A is another numerical variable.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Scrono13 on October 31, 2014, 11:09:24 pm
This is a geometric sequence, so the graph will have a curving pattern to it
Yeah but
Distance from x axis is same and this can't be for r less than -1
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on October 31, 2014, 11:09:53 pm
Why question6 is A in matrices
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on October 31, 2014, 11:11:11 pm
I mean E
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 11:16:55 pm
I mean E
The information tells you that the elements in the matrix are the sum of the row and column number for that matrix. For example, the first element is in column 1, row 1, therefore it is a 2. (1+1=2)
The element in row 1, column 2 is a 3. (1+2=3)
Row 2, column 1 is a 3. (2+1=3)
Row 2, column 2 is a 4. (2+2=4)
Row 3, column 1 is a 4.(3+1=4)
Row 3, column 2 is a 5. (3+2=5)
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on October 31, 2014, 11:17:52 pm
I thought it's times
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on October 31, 2014, 11:18:22 pm
Oh know.  I am not doing well. So sad
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 11:19:25 pm
Oh know.  I am not doing well. So sad
Don't be too concerned, just focus on exam 2 for now.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on October 31, 2014, 11:20:58 pm
Yes.i did all the practise one's from 2002-2013. But I only get 72.5% on the first one
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 11:22:05 pm
Yes.i did all the practise one's from 2002-2013. But I only get 72.5% on the first one
The exams from before 2006 are not that relevant any more, I would reccomend looking more thoroughly at the more recent ones.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on October 31, 2014, 11:24:21 pm
The exams from before 2006 are not that relevant any more, I would reccomend looking more thoroughly at the more recent ones.
Thank you. How much study score I can get.if I get 80%for exam 2. My SAC average is 86.7
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 11:28:44 pm
Thank you. How much study score I can get.if I get 80%for exam 2. My SAC average is 86.7
Predictions are never really accurate, but likely within the range of 35-38.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on October 31, 2014, 11:31:06 pm
Thanks Dan
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: zeus123456 on October 31, 2014, 11:35:11 pm
Their is no logical explanation of why Question 8 Number Patterns wouldn't be A.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on October 31, 2014, 11:47:08 pm
Their is no logical explanation of why Question 8 Number Patterns wouldn't be A.
I did not do number patterns for Further maths, and I didn't do the solutions for it as posted on here, but having a look at the notes and the question, my understanding is that a geometric sequence needs to be curved, to show an exponential increase (which would be option B), whereas option A is more of a linear increase.
That's just my quick understanding of it, as I said, I did not do that module.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Durango on October 31, 2014, 11:48:56 pm
Yeah but
Distance from x axis is same and this can't be for r less than -1

How do you mean? if it's less than -1 then it can be -2.
its not the distance that matters as we aren't given any numeric values on the graph, it's about the shape of the graph of it switching between positive and negative due r being <-1, it arching because it's a geometric sequence, and lastly it arching away from the x axis because r is not greater than -1 and less than 1. the only graph that fits this description is B
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Aybeesea on November 01, 2014, 12:17:20 am
First of all thanks for the answers!
Just wondering what score i need roughly in exam 2 to achieve a study score of 45 I averaged 96% in my sacs and got 38/40 in exam 1 ( did c for 8.Core and D for 7.Networks) . Thankyou!
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Amber Holmes on November 01, 2014, 12:26:57 am
I think Question 6 in core is E as there are 3 outliers in the data and option A only has 2!
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 12:36:37 am
I think Question 6 in core is E as there are 3 outliers in the data and option A only has 2!
That question has been discussed many times now, the general consensus is still A. As the lower median is 30, and the upper is 50. Therefore q3+1.5xIQR =50+1.5x(50-30)=80. Therefore there's only two outliers.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: megannn on November 01, 2014, 12:46:49 am
Can someone please explain Que 8 networking, why is E the correct answer? like why are the others false? 
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 12:53:43 am
Can someone please explain Que 8 networking, why is E the correct answer? like why are the others false?
A. You can have more than one Cp
B. The cp could have only one activity
C. The cp does not necessarily need to include the activity with the longest duration, if another path contains say three or four activities, and their combined duration is greater than the single biggest, then the single biggest would not necessarily be on the cp.
D. If you have two critical paths, reducing the time of only only activity will not always reduce the minimum completion time, as the other cp would not be affected.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Scrono13 on November 01, 2014, 12:54:45 am
Hey Zeus!
I chucked that answer up there. Here's why.
As it was just mentioned, the r values has to be less than -1. For option A, the graph shows that r = -1.
The only other graph that properly shows a geometric sequence with gradient of r < -1 is B.
If it was r < 0, then both A and B are fine. But r < -1.
Sub in some values! You'll see what I mean.

Hope this helps!

How does A show r=-1?
If r=-1, the term number would just alternate negative and positive, but be the same. Say I made a=-2 (a<0), if r=-1, t1=-2, t2=2, t3=-2, t4=2 etc

For example, I said for mine, a=-1 (as a<0) and said r=-2 (r<-1)
From graph A, you could see t1=-1, t2=2, t3=-4 as the y coordinate is increasing each time with graph a?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on November 01, 2014, 12:56:00 am
Can u tell me why Q7 is E not A
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 12:56:54 am
Can u tell me why Q7 is E not A
What module?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on November 01, 2014, 12:57:14 am
Network
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 12:58:34 am
Network
Because you can rearrange networks, they are not fixed. By rearranging the edges and vertices, they can all be redrawn as planar graphs.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on November 01, 2014, 12:59:21 am
Planar tree have no crossing edges
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 01:00:07 am
Planar tree have no crossing edges
Yes, and when you redraw them with the vertices and edges rearranged, the edges do not cross
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Lucho23 on November 01, 2014, 01:19:32 am
How does A show r=-1?
If r=-1, the term number would just alternate negative and positive, but be the same. Say I made a=-2 (a<0), if r=-1, t1=-2, t2=2, t3=-2, t4=2 etc

For example, I said for mine, a=-1 (as a<0) and said r=-2 (r<-1)
From graph A, you could see t1=-1, t2=2, t3=-4 as the y coordinate is increasing each time with graph a?
Ok, yeah, I got my explanation completely wrong :P
But, it is B! I'll explain why.

Let's take a sequence where a = -1 and r = -2.
The sequence is as follows: -1, 2, -4, 8, -16, 32, -64, 128, -256, 512.
Option B properly shows this (because of its curve). B shows that the initial values will be small in the whole scheme of all 10 values. Then, as n increases, tn becomes larger and larger! Whenever r > 1 or r < -1, remember, the tn values simply get larger and larger forever! (larger, meaning, even in terms of negative numbers).
Option A shows that the tn values will continue to increase and decrease by steady amounts indefinetly. Have a look. Option A makes it look like the sequence is = -1, 2, -4, 6, -8, 10, -12, 14, -16, 18. This isn't correct.

I know this is a very weird and quite basic explanation without much maths behind it, however, do you see my point? Option B shows the tn values will form a curve and as the tn values increase, so too will the differences between successive terms! The differences between successive terms will not remain somewhat constant (like an arithmetic sequence). Option A Looks more like a sequence which is neither arithmetic, nor geometric.

I hope this clears up the confusion!

Please let me know your perception and why you might think I'm wrong :P
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Gutthi on November 01, 2014, 03:36:40 am
Hey how are you? I really need your help and understanding of this:

I'm paranoid that I may have over shaded the boxed for the Multiple Choice Answer sheet. Like, I think I may have gone too much over the boundaries for each box for it to be legible enough for the computer to read.

I would also like to know that if on the Multiple Choice Answer sheet you named your Modules in the boxes, but just in-case forgot to shade in the boxes, what can be done?

How does the computer interpret shaded answers, will it accept answers if the boxes are over shaded? ( this is how I shaded it --> http://postimg.org/image/5cahf0gab/ )

Thank you for help
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: LiquidPaperz on November 01, 2014, 09:21:52 am
Hey how are you? I really need your help and understanding of this:

I'm paranoid that I may have over shaded the boxed for the Multiple Choice Answer sheet. Like, I think I may have gone too much over the boundaries for each box for it to be legible enough for the computer to read.

I would also like to know that if on the Multiple Choice Answer sheet you named your Modules in the boxes, but just in-case forgot to shade in the boxes, what can be done?

How does the computer interpret shaded answers, will it accept answers if the boxes are over shaded? ( this is how I shaded it --> http://postimg.org/image/5cahf0gab/ )

Thank you for help

dont worry you'll be fine, as long as you didnt go into the other boxes

On another note, i completely misread 2 questions and these are how i lost my 2 marks + that postcode one, i feel really lost at the moment, anyone else have a similar problem and know how to combat this?

i know i should get around 57-60 on extended response (based on average)  but i really think my chance of 45+ is gone?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: plato on November 01, 2014, 09:23:21 am
Gutthi - Your over shading should be ok. If over shading touches an adjacent box, then that could be a problem.
if the box to indicate the module that has been answered has not been filled in, I understand the computer will flag this answer sheet to be looked at by a person. if the name of the module is found to be written there, that person will fill out the appropriate box manually and will resubmit the answer sheet to the computer scan. if the module name is also missing then I think they try to contact the student.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Alex vlassis on November 01, 2014, 10:09:47 am
any ideas on the approx. minimum score over both exams to get a 40 ss?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Zues on November 01, 2014, 10:56:19 am
I made 2 really stupid mistakes in exam 1, like misread it. Is losing marks on exam 1 worse then exam 2? and provided with a 37/40 on exam 1 and a 60/60 on exam 2, what sort of score will i be looking at? Rank 2 in a quite a strong cohort.

Thanks  :D :D
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: lucyg on November 01, 2014, 11:10:53 am
Wouldn't question 2 in matrices be C?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 11:26:17 am
Wouldn't question 2 in matrices be C?
The only vertex that can be reached from vertex Y, is vertex D. Vertex C cannot be reached.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 11:27:28 am
Can someone please help me with what study score I'd be looking at? Ranked 1 in an average cohort with an average of 98% on SACs and I got 35/40 for exam 1? (made some stupid mistakes!) Thanks :)
Low 40's depending on exam 2 score
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 11:28:57 am
I made 2 really stupid mistakes in exam 1, like misread it. Is losing marks on exam 1 worse then exam 2? and provided with a 37/40 on exam 1 and a 60/60 on exam 2, what sort of score will i be looking at? Rank 2 in a quite a strong cohort.

Thanks  :D :D
Technically marks on exam one are worth more than those on exam 2, but the difference is marginal. You would still be looking at 45+ with a 60/60
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: simsgrove on November 01, 2014, 12:47:27 pm
Hi All Has anyone got a copy or a link to the questions please.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: clidedescope on November 01, 2014, 12:50:59 pm
Just a question - on the answer sheet it made us shade the box of our  chosen modules AND write it down in the box provided.
One of my friends ticked the box instead of shading it..........  :o Will this matter in the process of the exams being marked as they are marked on the computer? Or will it be ok as we also had to write it down?

I think they made you write it down in case something like that happened. It should be fine :)
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: hanners on November 01, 2014, 02:11:23 pm
I have a question regarding Q9 of Core -

I did the equation and got -0.005, however, surely fuel consumption plotted against the weight of a car would be a positive slope?
E.g. wouldn't fuel consumption go up as the car for heavier and vice versa?
Thus, I gave D as the answer instead of B... what do you guys think?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: clidedescope on November 01, 2014, 02:25:23 pm
I have a question regarding Q9 of Core -

I did the equation and got -0.005, however, surely fuel consumption plotted against the weight of a car would be a positive slope?
E.g. wouldn't fuel consumption go up as the car for heavier and vice versa?
Thus, I gave D as the answer instead of B... what do you guys think?

That's what I thought. But I've been to lectures and they've said not to rule out an answer just because it doesn't seem probable in the real world. It would have had to be a negative slope because the information we were told lead us to that conclusion.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: hanners on November 01, 2014, 02:28:19 pm
That's what I thought. But I've been to lectures and they've said not to rule out an answer just because it doesn't seem probable in the real world. It would have had to be a negative slope because the information we were told lead us to that conclusion.

Damn... \:
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: FER0058 on November 01, 2014, 02:37:56 pm
Proposed answers are below! If you feel like something is incorrect, post what you think it is and why and if you're right, we'll change the original thread :)

Core.
1. B
2. D
3. C
4. D
5. B
6. A
7. C
8. E
9. B
10. E
11. E
12. A
13. C

Number Patterns
Spoiler
1. A
2. C
3. D
4. E
5. B
6. E
7. C
8. B
9. D

Geometry and Trigonometry
Spoiler
1. B
2. C
3. D
4. C
5. D
6. E
7. A
8. B
9. D

Graphs and Relations
Spoiler
1. B
2. E
3. D
4. B
5. A
6. D
7. B
8. B
9. C

Business-related Mathematics
Spoiler
1. D
2. C
3. C
4. E
5. C
6. D
7. B
8. D
9. E

Networks
Spoiler
1. D
2. D
3. C
4. A
5. A
6. B
7. E
8. E
9. D

Matrices.
Spoiler
1. A
2. B
3. B
4. C
5. C
6. E
7. D
8. E
9. C

Good luck with exam 2 everyone!




Hey DAN, how did you get question 9 in bus maths as E shouldnt it be D
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: brenden on November 01, 2014, 02:40:32 pm



Hey DAN, how did you get question 9 in bus maths as E shouldnt it be D
D is what happens when you don't count the interest apparently.
Title: Re: 2014 further maths exam 1- tentative solutions
Post by: happily on November 01, 2014, 03:18:13 pm
sorry i meant question 1
it goes through each vertex once, and does not return to the original vertex, hence a Hamiltonian path
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Zealous on November 01, 2014, 03:38:10 pm
Hey DAN, how did you get question 9 in bus maths as E shouldnt it be D

Using the annuities formula with 47 monthly payments of $802 with 4.75% interest per annun (alternatively, use the less complicated finance solver):



Add 4.75% interest (p.a) for final payment:

Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: DylanM on November 01, 2014, 03:58:18 pm
 ??? I still don't see how postcode is categorical...
Ow well, what can you do?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: demand&supply on November 01, 2014, 04:05:05 pm
??? I still don't see how postcode is categorical...
Ow well, what can you do?

This is because a data is numerical when you can measure it, postcode cannot be measured as they are numbers/codes allocated to categorize suburbs, hence it is a categorical data. Think about shoe size for example, same principle.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: DylanM on November 01, 2014, 04:21:08 pm
This is because a data is numerical when you can measure it, postcode cannot be measured as they are numbers/codes allocated to categorize suburbs, hence it is a categorical data. Think about shoe size for example, same principle.
Alright thanks I get it now, still tricky question
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 04:24:48 pm



Hey DAN, how did you get question 9 in bus maths as E shouldnt it be D
Sorry, I didn't do the business solutions, they were added by the moderators.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 04:27:11 pm
I have a question regarding Q9 of Core -

I did the equation and got -0.005, however, surely fuel consumption plotted against the weight of a car would be a positive slope?
E.g. wouldn't fuel consumption go up as the car for heavier and vice versa?
Thus, I gave D as the answer instead of B... what do you guys think?
It's because the consumption was worded in reverse to normal... Rather than being in the number of litres you use per kilometre, it was the number of kilometres traveled per litre of fuel. Therefore as the weight increases, the number of kilometres travelled per litre is reduced.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Sanguinne on November 01, 2014, 04:30:35 pm
can someone explain why q7 in graphs and relations is B. Some of the other options seem correct
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Lucho23 on November 01, 2014, 05:15:50 pm
can someone explain why q7 in graphs and relations is B. Some of the other options seem correct
So it's which one is actually, completely true.
A: All points in the feasible region (including boundaries if its greater/less than or equal to) are solutions, so, there are multiple points that are solutions.
B: Only points in the feasible region are valid solutions as they satisfy all constraints.
C: This is not true because you can have greater/less than inequalities with no 'equals to'. This is when you draw dotted lines.
D: This is not true as all points in the feasible region and the boundaries (as explained in A) are solutions, not only the corner points.
E: This is not true because firstly it fits in with the explanation for option D. Building on that, corner points with decimals are in theory solutions! It's only when your variables can be integers in real-life scenarios (eg. x = people) that the corner points with deicmal coordinates cannot be valid solutions.

Hope it makes more sense now :)
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Aayabdo on November 01, 2014, 05:44:26 pm
Hi, im not sure that question 7 in networks is correct. All four graphs do not satisfy the equation of       v+f-e=2 which suggests that they are not planar therefore the answer is A
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 05:53:38 pm
Hi, im not sure that question 7 in networks is correct. All four graphs do not satisfy the equation of       v+f-e=2 which suggests that they are not planar therefore the answer is A
You have to redraw them first. When they are redrawn with no intersecting edges, they are all planar and all satisfy Euler's formula. The answer is E
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: abcdefg9999 on November 01, 2014, 06:06:59 pm
In number patterns module, for question 9, does anyone get D as the answer like me?  :)
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: AngelWings on November 01, 2014, 06:12:45 pm
In number patterns module, for question 9, does anyone get D as the answer like me?  :)

I believe it says 9. D in the suggested answers on the OP?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: lokzo on November 01, 2014, 07:55:45 pm
Anyone know if there is any correlation between what's tested on exam 1 and what's tested on exam 2?

Ie. Is it likely for them to assess different parts of the course in exam 2 compared to exam 1, or roughly the same topics as exam 1?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 08:04:53 pm
Anyone know if there is any correlation between what's tested on exam 1 and what's tested on exam 2?

Ie. Is it likely for them to assess different parts of the course in exam 2 compared to exam 1, or roughly the same topics as exam 1?

Usually any common areas that aren't examined in exam 1 will be covered in exam 2. For example, there wasn't much about least squares regression on exam 1, so I would expect there to be questions on that in exam 2, with a three median regression being less likely as it was on exam 1.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: lokzo on November 01, 2014, 08:16:14 pm
Usually any common areas that aren't examined in exam 1 will be covered in exam 2. For example, there wasn't much about least squares regression on exam 1, so I would expect there to be questions on that in exam 2, with a three median regression being less likely as it was on exam 1.

So has anyone gone through and picked out anything major that wasn;t assessed on exam 1, that should be on exam 2?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Zues on November 01, 2014, 08:36:36 pm
Anyone aware of how many marks you can drop across both exams and still get 45 or above?

ive dropped 3 on exam 1, but 2 of them was mis reading the question. If i get 60/60 on exam 2 what will i be looking at, if anyones aware?
Im on 98/100 on sacs near the top rank and in a extremely strong cohort
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: pfrancey on November 01, 2014, 08:38:45 pm
Can someone explain Q13 in the core? I got D... rise over run gave me roughly 0.4 which is closest to 0.2?
Also Q4 in Geometry and trig I got D? The horizontal distance between A and B.. I'm just not completely certain...
If anyone could bring me some clarity that would be much appreciated!!
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 08:39:23 pm
Anyone aware of how many marks you can drop across both exams and still get 45 or above?

ive dropped 3 on exam 1, but 2 of them was mis reading the question. If i get 60/60 on exam 2 what will i be looking at, if anyones aware?
Im on 98/100 on sacs near the top rank and in a extremely strong cohort
General rule for a 45-50 is one mark lost is one study score.
It doesn't matter how you dropped them, if you dropped three then you're looking at around a 47/48 if you ace exam 2.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 08:41:52 pm
General rule for a 45-50 is one mark lost is one study score.
It doesn't matter how you dropped them, if you dropped three then you're looking at around a 47/48 if you ace exam 2.
The lower and upper medians give the gradient, they had the same y value, therefore a gradient of 0. Double check your median points?

As for trig, the angle of depression was 23, therefore the interior angle of the triangle connecting a and b, is 67 degrees (90-23). So you use tan(67)=horizontal dist/150
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: byCrypt on November 01, 2014, 08:44:16 pm
I have a question regarding Q9 of Core -

I did the equation and got -0.005, however, surely fuel consumption plotted against the weight of a car would be a positive slope?
E.g. wouldn't fuel consumption go up as the car for heavier and vice versa?
Thus, I gave D as the answer instead of B... what do you guys think?

Note that it says fuel consumption, in km per litre of fuel. So a car that weights more would travel less km with one litre of fuel.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: 2qt on November 01, 2014, 08:58:28 pm
I got 36/40 on the first exam, I am ranked top 20  and on 94% sac avg in a very strong cohort,
if i get 56-59/60 on the second exam what SS am i likely to get?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 09:02:36 pm
I got 36/40 on the first exam, I am ranked top 20 in a very strong cohort,
if i get 56-59/60 on the second exam what SS am i likely to get?
[/quote
Top 20 is very vague, what was your sac average?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 01, 2014, 09:19:42 pm
94% sac avg full marked everyone but trig which i completely screwed.
56/60 would be about a 42-44, depending on cohort strength and overall state performance.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: hanners on November 01, 2014, 11:05:59 pm
Note that it says fuel consumption, in km per litre of fuel. So a car that weights more would travel less km with one litre of fuel.

Yea, it'd travel less km but consume more fuel per km, hence fuel consumption...
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Zues on November 02, 2014, 09:46:54 am
any way to boost my mood, did so many practice exams and only got 37/40. All three were the stupidest mistakes. Rank 2 in a extremely strong cohort, acing exam 2 is there any chance of a 48?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 02, 2014, 10:38:17 am
any way to boost my mood, did so many practice exams and only got 37/40. All three were the stupidest mistakes. Rank 2 in a extremely strong cohort, acing exam 2 is there any chance of a 48?
48 is still a chance, especially in a strong cohort.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Lucho23 on November 02, 2014, 10:50:07 pm
Good luck for Exam 2 everyone!
Just aim to kill it, don't worry about what study score you'll get if you drop x number of marks. Give it your all and make sure you come out happy with yourself and how you approached the exam! :)
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Daniel55555555 on November 03, 2014, 08:40:27 pm
Anyone have exam2 answers
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 03, 2014, 08:50:17 pm
Anyone have exam2 answers
There's a new thread with the answers, in the same forum as this thread
Further Maths Exam 2: Answers + Discussion!
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: sarah2.0 on November 04, 2014, 01:39:46 pm
could someone please post the answers for geometry and trigonometry, and matrices, as for some reason i cannot open the spoilers
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 04, 2014, 01:55:30 pm
could someone please post the answers for geometry and trigonometry, and matrices, as for some reason i cannot open the spoilers
Geometry and Trigonometry
1. B
2. C
3. D
4. C
5. D
6. E
7. A
8. B
9. D

Matrices.
1. A
2. B
3. B
4. C
5. C
6. E
7. D
8. E
9. C
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Ethan.km on November 05, 2014, 09:55:15 pm
Question 7 in business I got E anyone else?
Question 8 in networks I got D?
Question 9 in networks I got E?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 05, 2014, 10:10:47 pm
Question 7 in business I got E anyone else?
Question 8 in networks I got D?
Question 9 in networks I got E?
How did you get those answers in networks?
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: drewco.australia on November 06, 2014, 09:14:23 pm
I believe in question 4 of the core, Postcode is potentially numerical. They do try and order post codes numerically, but I could also see the argument for categorical as well. It's a toughie and I think we just have to wait to see the Assessor's report :)

Question 6 in the core is B because Q1 is 30 and Q2 is 50, therefore the IQR is 20. 20*1.5 = 30, 40+30 is 70, so just before 70 is the upper outlier fence. There are 3 values above 70 and therefore 3 outliers. It could ONLY be B or E.

Question 8 in the core is D, not E. It can't possibly be E, as stem and leaf plots are for numerical variables only.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: Dan1995 on November 06, 2014, 09:19:54 pm
I believe in question 4 of the core, Postcode is potentially numerical. They do try and order post codes numerically, but I could also see the argument for categorical as well. It's a toughie and I think we just have to wait to see the Assessor's report :)

Question 6 in the core is B because Q1 is 30 and Q2 is 50, therefore the IQR is 20. 20*1.5 = 30, 40+30 is 70, so just before 70 is the upper outlier fence. There are 3 values above 70 and therefore 3 outliers. It could ONLY be B or E.

Question 8 in the core is D, not E. It can't possibly be E, as stem and leaf plots are for numerical variables only.
I agree the postcode one could go either way however I am much more convinced that it is categorical as it is less likely to be numerical as you cannot count or measure a postcode. It is the area you live in as defined by a number, therefore it is a numerical representation of a category.

You are correct except it should be 50+30 which equals 80 not 40+30. The answer is A.

Sorry but you are incorrect again here, a back-to-back stemplot shows the relationship between two categorical variables and a numerical variable, check your bivariate notes.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: drewco.australia on November 10, 2014, 10:43:01 am
I agree the postcode one could go either way however I am much more convinced that it is categorical as it is less likely to be numerical as you cannot count or measure a postcode. It is the area you live in as defined by a number, therefore it is a numerical representation of a category.

You are correct except it should be 50+30 which equals 80 not 40+30. The answer is A.

Sorry but you are incorrect again here, a back-to-back stemplot shows the relationship between two categorical variables and a numerical variable, check your bivariate notes.

I think you may be right about the postcode, but we'll see.

Oh yes, such a stupid mistake. I hate myself for that now -.-

I misinterpreted the question, but now I see that it's E. I was completely on the wrong track.
Title: Re: Further Math Exam 1: Answers + Discussion!
Post by: skybluemaniac on November 12, 2014, 10:45:50 pm
Does anyone have the paper? I'm interested into seeing what it look like this year. Thanks :)