Post by: Joseph41 on October 09, 2018, 12:00:33 pm
This thread is for all exam related discussion. Was it easy? Was it hard? What did you get for 'that' tough question?? Feel free to pop any and all of your thoughts below.
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Post by: jasn9776 on October 25, 2018, 05:33:05 pm
Post by: RuiAce on October 25, 2018, 05:36:59 pm
That was a interesting test the first part was easy but then last part of 15 and 16 was rough. I guess it's partly down to my study. Like basically I've never actually done a past paper q16 without looking at the answers. Lesson learnt.They are hard after all. For MX1 basically just watch out for Q14.
What topics were those questions on?
Post by: jasn9776 on October 25, 2018, 05:41:25 pm
Post by: RuiAce on October 25, 2018, 05:44:31 pm
So that's the probability everyone's complaining about...
Post by: owidjaja on October 25, 2018, 05:46:19 pm
Question 15 and 16 was a nightmare. Like, the last question with the series/financial math, I couldn't find a pattern, it took me awhile to establish an equation. I'm not even sure if I built up the equation correctly. The minima/maxima question there with the cone I struggled with as well. My working out to find the first derivative was a mess, I didn't know what I was doing. And then the final part of the question where we had to find the angle, no clue what I did. I tried to find the second derivative but that turned messy.
Oh yeah, the probability questions were a bit difficult too. There were 3 probability questions, the first one was in the multiple choice. The other two was a bit rough, especially the last one. I didn't know what I was doing because the situation given was weird- like, there was a game where you rolled two dice and the third one had to be the number in between the two numbers you rolled previously. No clue what I was doing so I tried to write down something.
So TL;DR: math was rough. RIP math mark
Post by: parallaxd on October 25, 2018, 05:47:57 pm
Post by: headsup on October 25, 2018, 05:58:34 pm
Questions 11-13 were actually fine. To be honest, I'm actually proud of the graph I sketched in Question 13 and managed to figure out a proof for the geometry questions. Question 14 took me a while to complete, and that's where my dodgy working out came in. I wasn't sure what I was doing so I wrote down as much as I could and tried to end up with an answer even though the working out was dodgy. Like, there was a question about finding the k value based on a given equation and there were no stationary points- I'm pretty sure I've encountered a question like that, I just didn't know what to do. There was another question where we had to find a k value under the curve- no clue what to do.Basically the same... I managed so writing for each question 😋
Question 15 and 16 was a nightmare. Like, the last question with the series/financial math, I couldn't find a pattern, it took me awhile to establish an equation. I'm not even sure if I built up the equation correctly. The minima/maxima question there with the cone I struggled with as well. My working out to find the first derivative was a mess, I didn't know what I was doing. And then the final part of the question where we had to find the angle, no clue what I did. I tried to find the second derivative but that turned messy.
Oh yeah, the probability questions were a bit difficult too. There were 3 probability questions, the first one was in the multiple choice. The other two was a bit rough, especially the last one. I didn't know what I was doing because the situation given was weird- like, there was a game where you rolled two dice and the third one had to be the number in between the two numbers you rolled previously. No clue what I was doing so I tried to write down something.
So TL;DR: math was rough. RIP math mark
Definitely better than the trial.... Now just hope for good mark!!!!
Anyway...
3 down
5 to go 😀
Post by: RuiAce on October 25, 2018, 06:00:56 pm
A paper that was very much doable, but could easily be flunked just because of the types of curveball questions they gave?
(Also remember, y'all are approaching/already at the end of math forever ;))
There's been complaints about geometry?
Post by: kauac on October 25, 2018, 06:05:18 pm
MC was okay, but a bit challenging - potentially because I was nervous and trying to rush through them. Did NOT like the weird probability questions. I can't really remember what other areas I found particularly difficult - just a blur of annoying questions, haha! Ahhh - that's right - I think I couldn't work out one of the geometry proofs - I feel like I needed to use sine rule, and something else, but couldn't wriggle my way through it!
The q16 financial question was actually not too bad, because I got both of the two show questions, and made some leeway in the last part. Similarly with the cone question, at least I scraped some marks doing the "show" parts, thankfully.
Did anyone else have to get extra writing booklets?
I had to use 3 extra, but potentially because I left some gaps to try and rework some of the harder questions...
could easily be flunked just because of the types of curveball questions they gave?Think I fit into this category, oops!
Post by: RuiAce on October 25, 2018, 06:10:22 pm
Post by: parallaxd on October 25, 2018, 06:11:01 pm
MC was okay, but a bit challenging - potentially because I was nervous and trying to rush through them.
Yea I found the MC a bit hard as well
Post by: headsup on October 25, 2018, 06:14:52 pm
Did anyone else have to get extra writing booklets?Yeah.... 7!!!!!!!
I had to use 3 extra, but potentially because I left some gaps to try and rework some of the harder questions...
ridiculous...
Good job all the same ppl!!!!!!
Post by: varun.amin on October 25, 2018, 06:15:14 pm
Q11-13: Pretty standard compared with the past few years of HSC exams.
Q14: Series question was interesting, I realised afterwards that you were meant to seperate the 2^n + n into an arithmetic series and a geometric series. I ended up writing out all twenty terms to find the sum (that was a waste).
Q16: The Max Min question was okay, I struggled to find the maximum in terms of theta. The probability question was made a lot easier by writing up a table with the range of values created by each possibility and then working it out from there.The first two parts of the series question were easy enough to prove (find A2 & A3). I struggled with the last part, the only part I worked out was that r=1.05/1.04
Post by: infectmarshroom on October 25, 2018, 06:17:09 pm
Post by: RuiAce on October 25, 2018, 06:19:16 pm
Above post would make sense with the r=1.05/1.04
Also, probability had area and derivatives...?
Post by: parallaxd on October 25, 2018, 06:24:21 pm
What did everyone get for the second part of the probability question in Q16?
5/27 i think. idk if its right
Post by: infectmarshroom on October 25, 2018, 06:32:05 pm
Post by: parallaxd on October 25, 2018, 06:37:28 pm
I got 5/27 aswell... relieved. For the max minima did you guys l=r.theta and 2pi.radius to link value of x with theta??
yea pretty sure I did it like that. My answer was a weird number tho if I remember with roots on top and bottom
Post by: infectmarshroom on October 25, 2018, 06:40:51 pm
Post by: kauac on October 25, 2018, 06:41:55 pm
Same.. i rationalised it... hope market likes me for that lol. For the multi with the point of inflexion derivative graph did you get x=b?
I got x=b as well. :)
Post by: Blissisignorance on October 25, 2018, 06:58:34 pm
The only thing I'm worried about is the probability question in MCQ, about selecting shoes to get a pair.
I did 1/4, but I think the answer should be 1/7 because you're selecting the second shoe from 7 other shoes for a pair, but you don't count the probability of finding the first shoe since it's that what cause you to choose the second shoe.
All in all, a bit harder than recent years, but there've been harder papers than these.
Post by: sourish on October 25, 2018, 07:06:56 pm
Post by: gilliesb18 on October 25, 2018, 07:14:49 pm
Did anyone understand that last part of q16? I got parts 1&2 which were giveaway marks really... But just couldn't figure out that last one!!
Looking at what everyone else got for MC I reckon I stuffed up a fair bit!!
Post by: horse9996 on October 25, 2018, 07:23:02 pm
The optimisation question was quite unique, definitely will differentiate people. I think I ended up getting it, I was so happy
What was that last question? I was so close! Just have decimals rather than hundreds in the fraction on the left what was all to the power of n, ah so annoying!
Also no indefinite integrals? Quite interesting
Overall a fairly challenging paper with a few curveballs, I think I did really well but I know some of my friends weren't feeling the same way
Post by: Blissisignorance on October 25, 2018, 07:25:19 pm
MCQ: there were a couple which were a bit strange but I think I ended up getting themNo, you should have decimals to the power of n. Then, taking the n out, you change the decimals to hundreds by multiplying 100/100.
The optimisation question was quite unique, definitely will differentiate people. I think I ended up getting it, I was so happy
What was that last question? I was so close! Just have decimals rather than hundreds in the fraction on the left what was all to the power of n, ah so annoying!
Also no indefinite integrals? Quite interesting
Overall a fairly challenging paper with a few curveballs, I think I did really well but I know some of my friends weren't feeling the same way
Post by: horse9996 on October 25, 2018, 07:27:35 pm
No, you should have decimals to the power of n. Then, taking the n out, you change the decimals to hundreds by multiplying 100/100.
What do you mean 'take the n out' when it's a power? Also I had the RHS as what the question wanted, so I should get 2/3 which is fine
Post by: fun_jirachi on October 25, 2018, 07:31:45 pm
It was on the cone question in Q16, I did everything right except I copied down the wrong value for the radius of the cone, so I screwed up the last part of the question pretty hard seeing as I didnt even answer the question properly. It was so stupid because I checked and rechecked but I couldnt even see that my value for theta was far too big
Really super duper pissed at myself >:( >:( >:(
Post by: Blissisignorance on October 25, 2018, 07:33:26 pm
What do you mean 'take the n out' when it's a power? Also I had the RHS as what the question wanted, so I should get 2/3 which is fineIt's 1.04n/1.05n
Then, you do (1.04/1.05)n because it's a common power
Then multiply by 100/100 and you get (104/105)n
Post by: fun_jirachi on October 25, 2018, 07:36:09 pm
Rip. I heard you guys had a growing annuity again for the finance question. No wonder you guys are complaining about it a lot - that's one of the considerably harder curveballs I've seen. (There was a similar question in Jamon's compilation but to be honest I hardly expected anyone to memorise that particular one.)
Above post would make sense with the r=1.05/1.04
Also, probability had area and derivatives...?
Just noticed this, it wasn't particularly terrible. I just spent 30 minutes on it before I realised the first term in the geometric series was meant to be raised to the n-1th power, not the nth. Probability was maybe too heavily emphasised, but outside of silly mistakes WHICH I CAN NEVER EVER SEE I feel this paper was similar to ones we've seen before, though maybe with a different curveball question
EDIT: tbh i always trip up on the max min even when I know how to do it, still steamed
Post by: horse9996 on October 25, 2018, 07:38:40 pm
It's 1.04n/1.05n
Then, you do (1.04/1.05)n because it's a common power
Then multiply by 100/100 and you get (104/105)n
But if you times the LHS by 100, don't you have to times the right as well?
Post by: jasn9776 on October 25, 2018, 07:40:56 pm
Post by: Blissisignorance on October 25, 2018, 07:41:45 pm
But if you times the LHS by 100, don't you have to times the right as well?You're doing (1.04x100/1.05x100)n as 100/100=1, so you're just basically multiplying it by 1.
Post by: parallaxd on October 25, 2018, 07:45:34 pm
What method did you guys use to get 5/27 did you just do 20/36*average probability by adding them up and dividing by 20. Or was there an easier method?
I literally just summed up every situation. This was my working -> 2(1/36(1/6+2/6+3/6+4/6) + 1/36(1/6+2/6+3/6) + 1/36(1/6+2/6+1/6))
Post by: fun_jirachi on October 25, 2018, 07:47:45 pm
What method did you guys use to get 5/27 did you just do 20/36*average probability by adding them up and dividing by 20. Or was there an easier method?
I did it by cases. So basically there were 20 different cases.
8 had one number in between, so pulling a win (for one combo) would have the probability 1 in 6.
6 had two numbers in between, so pulling a win (for one combo) would have the probability 1 in 3.
4 had three numbers in between, so pulling a win (for one combo) would have the probability 1 in 2.
2 had four numbers in between, so pulling a win (for one combo) would have the probability 2 in 3.
So the total probability was
Which wouldve gotten you your 5/27.
Post by: horse9996 on October 25, 2018, 07:49:19 pm
You're doing (1.04x100/1.05x100)n as 100/100=1, so you're just basically multiplying it by 1.
Oh yea that makes sense. Oh well! I think I did really well overall so one mark won't mean too much
Post by: infectmarshroom on October 25, 2018, 10:40:56 pm
Post by: fun_jirachi on October 25, 2018, 10:43:06 pm
Post by: gershadev on October 26, 2018, 09:36:45 am
Post by: RuiAce on October 26, 2018, 09:42:06 am
Post by: Ellielh on October 26, 2018, 10:48:01 am
Edit: https://drive.google.com/file/d/1Jf5WULe618G0fI5sREq2o7c5HrIDcuoo/view?usp=sharing
Here is the link to it. Tell me if it doesn't work.
#ripmymathsmarks
Post by: Sheeplamb47 on October 26, 2018, 11:05:02 am
Post by: MrBarbour on October 26, 2018, 11:08:50 am
Post by: Ellielh on October 26, 2018, 11:09:45 am
Hang on, with those 2U solutions for question 13 c ii) (The population in 2020 one), they've used 100 years from 1910, when 2020 is 110 years from 1910. I might be wrong, but could someone please check that, I got 424 million or something
I got 424 million as well by using 110 years. I think (hope) the solutions are incorrect. A couple other people in the group said they got 424 mil as well.
Post by: Sheeplamb47 on October 26, 2018, 11:12:00 am
Post by: Ellielh on October 26, 2018, 11:19:08 am
Okay, thank God, I hope so. Their working doesn't even work to get the answer they show. Hoping it's incorrect
I'm also hoping many of the later answers in questions 15 and 16 are incorrect. You know, I had some pretty stellar answers that I think they should mark off ;)
Post by: Sheeplamb47 on October 26, 2018, 11:27:13 am
Post by: headsup on October 26, 2018, 11:39:55 am
Someone posted a copy of the answers on the hsc discussion page. I'll see if I can download it.I cannot seem to get it.... would you be able to upload as a PDF??? Thanks!
Edit: https://drive.google.com/file/d/1Jf5WULe618G0fI5sREq2o7c5HrIDcuoo/view?usp=sharing
Here is the link to it. Tell me if it doesn't work.
#ripmymathsmarks
Post by: askaerdf on October 26, 2018, 11:47:44 am
Post by: Ellielh on October 26, 2018, 11:47:45 am
I cannot seem to get it.... would you be able to upload as a PDF??? Thanks!
It's not letting me download a copy as it isn't document. Are you trying to open it on your phone? If so, that didn't work for me before, but opening it on my computer did.
I'll see if I can get a pdf version
Post by: headsup on October 26, 2018, 11:48:56 am
Thanks for that....
Post by: MB_ on October 26, 2018, 12:37:49 pm
Post by: Ellielh on October 26, 2018, 12:55:56 pm
https://www.docdroid.net/EvteQKZ/2-unit-hsc-2018-solutions.pdf
Legend. Thank you!
Post by: bigro27 on October 26, 2018, 01:20:58 pm
Post by: RuiAce on October 26, 2018, 01:24:36 pm
I think I'm looking at a 92 raw at the moment, does anyone know what that'd align to? Lost all my marks in q16 :(At least 93. Possibly 95 but I haven't seen your paper yet so I can't judge that far with confidence
Post by: superjerry12 on October 26, 2018, 01:45:24 pm
Honestly comparing this to the 2013 paper in which the band 6 cutoff was 75, i think i wouldve gotten a better raw mark in 2013 then this years, im not sure if thats just me but i think we could be seeing a lower band 6 cutoff this year
I think cut off will be around 85 imo. This paper was slightly easier than 2013's but i completely messed up and currently looking at a 75 ish raw. Not gonna end up well for me is it? lmao
Post by: kauac on October 26, 2018, 03:04:29 pm
Post by: Lollzza on October 26, 2018, 04:59:20 pm
Post by: gershadev on October 26, 2018, 06:25:10 pm
Or what the B6 cutoff would be?
Post by: InnererSchweinehund on October 29, 2018, 04:11:51 pm
Pretty much like everyone else the exam was okay until Q15/16.
I am in year 11 and sat the exam as part of the accelerated course.
Did anyone else do that? Also does anyone have any advice on potentially resitting the course?? I really don't want to and wanted to get it out of the way sort of thing, but because I won't know my marks for a while I don't know what to do...
I know the advice is probably based on personal preference/what atar you want to get, but a lot of my friends are saying 'if I get below a high band 5 i'll resit' etc. What would be the mark/band you would be happy to take before resitting??
Post by: Fergus6748 on October 29, 2018, 04:45:55 pm
Anyone know what an 84 raw would align toDepends on the cohort. If we all did terrible than it would be lower. There is no use in trying to guess how well you went, otherwise you might create unhealthy expectations of what you might get, and you could be disappointed by what you receive.
Or what the B6 cutoff would be?
Post by: azhussain on October 29, 2018, 05:03:26 pm
Also does anyone have any advice on potentially resitting the course?? I really don't want to and wanted to get it out of the way sort of thing, but because I won't know my marks for a while I don't know what to do...
I know the advice is probably based on personal preference/what atar you want to get, but a lot of my friends are saying 'if I get below a high band 5 i'll resit' etc. What would be the mark/band you would be happy to take before resitting??
I'd say don't resit it just because of the syllabus change; in hindsight it is likely give you the same outcome. I'm not sure about scaling though? This paper was considerably harder than recent previous papers and so I know that scaling will probably push a lot of peoples' raw marks upwards and I'm pretty sure you'd benefit from that (don't quote me on this though, I'm not 100% how it all works when you do a subject accelerated.)
Post by: RuiAce on October 29, 2018, 05:06:39 pm
I'd say don't resit it just because of the syllabus change; in hindsight it is likely give you the same outcome.Just a remark on this - the mathematics (2U/3U/4U) syllabuses are set to stay for one more year, as opposed to everything else.
Post by: headsup on October 29, 2018, 05:20:55 pm
If you feel that you really needed to do better than there isn't really harm starting to relearn until results are released.
In the end it is not the be-all and end-all.
Post by: fun_jirachi on October 29, 2018, 06:14:15 pm
Hey everyone,
Pretty much like everyone else the exam was okay until Q15/16.
I am in year 11 and sat the exam as part of the accelerated course.
Did anyone else do that? Also does anyone have any advice on potentially resitting the course?? I really don't want to and wanted to get it out of the way sort of thing, but because I won't know my marks for a while I don't know what to do...
I know the advice is probably based on personal preference/what atar you want to get, but a lot of my friends are saying 'if I get below a high band 5 i'll resit' etc. What would be the mark/band you would be happy to take before resitting??
Hey there!
I did this as well! I'd say it depends on what your thoughts are of the course. Being an accelerant means you've already learnt all the content, and you're essentially doing another year of stuff you already know. Also as an accelerant, your marks are likely higher than most of the cohort, so I think you'll do just fine! I can't say anything about resitting, since this exam isn't going to count to my ATAR (accelerants at my school are expected to continue with 4U and get a band 6 in this course). I think the mark/band that you would be happy with before resitting is really up to you and the ATAR you need to get into the course you want.
Hope this helps :)
Post by: azhussain on October 29, 2018, 06:53:45 pm
Just a remark on this - the mathematics (2U/3U/4U) syllabuses are set to stay for one more year, as opposed to everything else.Oh I didn't know that. Whoops!