How was Mathematics Paper 72 (Statistics 2)?

[randomcod]

Remember, no discussion until 24 hours have passed!

 

[nighthawk]

Hey guys, anyone gave their computing exam? Computing 9691 paper 32. If yes, what is the gt you expect to be? Vote at this thread.

https://www.xtremepapers.com/community/threads/computing-9691-paper-32-2015-expected-gt.41556/

 

[Abdo332]

I thought it went well. Not too hard not too easy..expected.

 

[randomcod]

Not a lot of people do this paper I guess

 

[Keirad]

Whenever you all can discuss please tell me your answers to Q3 about the golf one.

 

[randomcod]

Whenever you all can discuss please tell me your answers to Q3 about the golf one.

It was extremely weird, yes. I just noticed I put down the s.d. rather than the variance (which is what I think they were asking for). Could you PM your full answer to that q?

 

[shrz09]

I guess all was straight forward except for the Mr Crumb Q3 and that conditional probability thing.

 

[randomcod]

I guess all was straight forward except for the Mr Crumb

Yep
I got the answers right but I FORGOT TO SQUARE THE STANDARD DEVIATION for the golf! That's 1 mark gone. And I think that's it. Btw please delete the second part of your post as it does give a hint to people who haven't done the paper yet!

 

[pakhee]

Yep
I got the answers right but I FORGOT TO SQUARE THE STANDARD DEVIATION for the golf! That's 1 mark gone. And I think that's it. Btw please delete the second part of your post as it does give a hint to people who haven't done the paper yet!

 

[randomcod]

Huhh?

 

[pakhee]

Huhh?

Sorry,it accidentally got sent.Do you know where all the answers will be posted?

 

[randomcod]

Sorry,it accidentally got sent.Do you know where all the answers will be posted?

Hopefully justpastpapers.com?

 

[guccifier]

It was not that easy q3 and some other questions were hell

 

[Abdo332]

Come to think of it, it was pretty hard..

Q3 WAS CRAZY. I THOUGHT I WAS JUST OVER-THINKING IT. What'd you guys get for the E(X) and Var (X)?

and do you remember the answer for Q5 (iii)?

Also the conditional probability, the final question of the exam!? I just mulitplied P (Xgreaterthanequal 1) by my answer to part (ii)

 

[randomcod]

Come to think of it, it was pretty hard..

Q3 WAS CRAZY. I THOUGHT I WAS JUST OVER-THINKING IT. What'd you guys get for the E(X) and Var (X)?

and do you remember the answer for Q5 (iii)?

Also the conditional probability, the final question of the exam!? I just mulitplied P (Xgreaterthanequal 1) by my answer to part (ii)

Q3
E(X) was 150, Var (X) was 30,000 (I accidentally wrote the s.d. tho )
In the last q I'm afraid you had to divide P(X<4) by P(X>=1) :S

 

[randomcod]

Come to think of it, it was pretty hard..

Q3 WAS CRAZY. I THOUGHT I WAS JUST OVER-THINKING IT. What'd you guys get for the E(X) and Var (X)?

and do you remember the answer for Q5 (iii)?

Also the conditional probability, the final question of the exam!? I just mulitplied P (Xgreaterthanequal 1) by my answer to part (ii)

What was Q5? I might remember

 

[shrz09]

I also got E(x) 150 and Var(x) 30000, as far as q5 is considered it was regarding confidence intervals,part 3 was (0.96)^4 as per binomial process.While as per my concepts the conditional probability was not p(x<4)/p(x is greater or equal to 1).Rather it was p(x=1,2,3)/p(x is greater or equal to 1) as zero is not an intersection between p(x is greater or equal to 1) and p(x<4)

 

[zunipari]

I think variance was 112.5

 

[shrz09]

I think variance was 112.5

I am afraid you squared 0.75,instead of squaring 200 in your calculation for variance.

 

[randomcod]

I also got E(x) 150 and Var(x) 30000, as far as q5 is considered it was regarding confidence intervals,part 3 was (0.96)^4 as per binomial process.While as per my concepts the conditional probability was not p(x<4)/p(x is greater or equal to 1).Rather it was p(x=1,2,3)/p(x is greater or equal to 1) as zero is not an intersection between p(x is greater or equal to 1) and p(x<4)

I just realised you're probably right.