Exam 1 Answers

[maxleng]

For 10, k=3/2, not 2/3

i wrote k= 81/54

had no idea that was 3/2 lol, will i still get the mark??

anyone..

[Collin Li]

The root(20) and 81/54 things are probably at the discretion of the examiner.

If it doesn't say fully simplify your answer, it's possible you can get the mark, but it's also not guaranteed.

[maxleng]

yeah i dont think it said fully simplified, just "the value of k"... hope i get a nice examiner

[Collin Li]

A tutor for what?

Maths is quite easy, but a bad teacher can throw your hopes down the drain.

[Freitag]

Think i'll get a 37. That's better then I originally thought though. Stuffed up the independent probably one, which was SO fkn stupid of me.

[positive_viv]

I don't know. I just want to be able to grasp maths. Even if I screw it up for the exams, I really want to improve my math skills. I used to be good at math - but that was when math was just numbers and not letters lol. Doing Advanced Mathematics in Year 9 really made me slack too. I just figured 'hey, even if I do badly in this, I'm still better than the other people in my year level who do normal math.' Silly thing to think.

Last year I averaged high B's and low A's for my SACs.

This year,  I got D's (except for the calculus SAC. I actually got an A). My math teacher at the start of the year was super smart, but he was on a whole new level than we were. He'd explain things and we'd just be like...*blank* Then he left and we got a new one. He's okay. I don't really want to say anything bad about him because, in the end, regardless of what kind of teacher you have, it's also up to you to do the hard work. I got pretty discouraged.

Just couldn't apply all the formulas I learnt and stopped bothering to do the work

[un]

This is my problem: For the 50% coffee. I did this:

Pr(x>2) = Pr(x=3)  +   Pr(x=4)                       X^Bi(4,0.5)
            = 4c3(0.50)^3 x (0.50) + (0.50)^4
            = 2/16        +1/16
             =3/16

I Know the answer is 5/16. i stuffed up the 4c3 part(did it in my head).
How many marks do you reckon i could get for this question.

I also wrote all over the paper that is was binom, drew a table...

[Ahmad]

The root(20) and 81/54 things are probably at the discretion of the examiner.

If it doesn't say fully simplify your answer, it's possible you can get the mark, but it's also not guaranteed.

IMO it'd be ridiculous not to give full marks for that, however the sad reality is that you are right and they very well may penalise students. Nevertheless, I doubt they will!  :wink:

[Defiler]

Ditto positive_viv. I took adv. general last year and it was about then I went downhill with the harder maths but I do find it really interesting. I hope to pursue maths after school as I feel that I will enjoy it more perhaps? We'll have to see.

[tankia]

Oh crap..for the probablity one about people going to supermarkets or something..I wrote my answer in decimal places.....

Supermarkets? Are we talking about the same exam?

[Collin Li]

I encourage your attempt to continue maths in university out of interest and passion, rather than just being good at it. I'm more of the latter, but a bit of the former too.

[maxleng]

This is my problem: For the 50% coffee. I did this:

Pr(x>2) = Pr(x=3)  +   Pr(x=4)                       X^Bi(4,0.5)
            = 4c3(0.50)^3 x (0.50) + (0.50)^4
            = 2/16        +1/16
             =3/16

I Know the answer is 5/16. i stuffed up the 4c3 part(did it in my head).
How many marks do you reckon i could get for this question.

I also wrote all over the paper that is was binom, drew a table...

how many marks was the Q, i definatly think you'l get one,

i also screwed that Q up but defined it as binomial, n=4, p=.5 and Pr(x>2) = Pr(x=3)  +   Pr(x=4)

[tankia]

This is my problem: For the 50% coffee. I did this:

Pr(x>2) = Pr(x=3)  +   Pr(x=4)                       X^Bi(4,0.5)
            = 4c3(0.50)^3 x (0.50) + (0.50)^4
            = 2/16        +1/16
             =3/16

I Know the answer is 5/16. i stuffed up the 4c3 part(did it in my head).
How many marks do you reckon i could get for this question.

I also wrote all over the paper that is was binom, drew a table...

Lol. For this question, i couldn't remember the formula properly, and i added instead of multiply... @_@ How dumb of me.

[un]

Yes, it was out of 2. I hope a really 'nice' examiner marks it and for some reason gives me 2( i dont think this will happen, but I was once told by a lecturer that if you show all your working out clearly and do all this other crap, examiners might be inclined to understand ur pt and give you the marks).

[positive_viv]

This is my problem: For the 50% coffee. I did this:

Pr(x>2) = Pr(x=3)  +   Pr(x=4)                       X^Bi(4,0.5)
            = 4c3(0.50)^3 x (0.50) + (0.50)^4
            = 2/16        +1/16
             =3/16

I Know the answer is 5/16. i stuffed up the 4c3 part(did it in my head).
How many marks do you reckon i could get for this question.

I also wrote all over the paper that is was binom, drew a table...

how many marks was the Q, i definatly think you'l get one,

i also screwed that Q up but defined it as binomial, n=4, p=.5 and Pr(x>2) = Pr(x=3)  +   Pr(x=4)

I did that too. Do you get marks for doing that? I just did it anyway and hoped the examiners would take pity on me, and decide to give me at least a 0.5 for it