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S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST Tweet

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1. S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
Here are the solutions. Thanks for all the negative rep! I know Arsey is an insomniac but some of us need our beauty sleep!

It comes in two parts unfortunately (I just couldn't get it to less than 1MB).

I thought it was pretty easy with a couple of unusual questions so my best guess for grade boundaries is about 63 for an A.

Let me know what you think.

EDIT the value associated with the crit region in Q2 should be 0.0216 not 0.0215 (doing it in my head!)

People are questioning whether you should use Binomial or Poisson in the last question. Due to the values of n and p mean is not equal to variance and so a Poisson distribution will not give very accurate answers. I am sure that you will gain method marks for this question by using Poisson but the fact is that you may lose a number of accuracy marks.
Attached Files
2. S2 May 2012 Part1.pdf (762.1 KB, 11108 views)
3. S2 May 2012 Part2.pdf (538.9 KB, 9283 views)
4. Last edited by Gibbo81; 25-05-2012 at 15:05.
5. Open???

This was posted from The Student Room's iPhone/iPad App
6. I got n=45 anyone else??

This was posted from The Student Room's iPhone/iPad App
7. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
(Original post by meraphox)
I got n=45 anyone else??

This was posted from The Student Room's iPhone/iPad App
i got n=35 but a few people i know got n=38, so i have no idea!
8. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
Can you please post the unofficial mark scheme up please ? Im dying to see
9. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
i got 35
I need to knw

This was posted from The Student Room's iPhone/iPad App
11. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
It's 35 bruddas
12. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
(Original post by amoo94)
i got n=35 but a few people i know got n=38, so i have no idea!
That question , a and b , did you use poisson or binomial distribution ?
Last edited by tangkykiet; 25-05-2012 at 00:06.
13. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
Yeah, I got n=35.
14. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
How did people find it? ****ing Q6 I almost had a heart attack when I saw it
15. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
Most satisfying thing ever subbing in 10 into the TRIPLE PDF to CDF and realising it was 1 <3
16. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
(Original post by master_blaster66)
what did everyone get for the last qustion...the value of n
i got 16 but mine was wrong 2 other people I know got 35. I didn't even think to use the normal approximation. But I think it was only 3 marks. What did you get? And how did you find it overall??

BTW, when are the answers being posted??
17. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
(Original post by tangkykiet)
That question , a and b , did you use poisson or binomial expansion ?
what was a and b again
18. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
I got n=34 :/
19. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
Definitely 35 not 38.
20. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
(Original post by JordanS94)
How did people find it? ****ing Q6 I almost had a heart attack when I saw it
was that about a sampling distribution for a range or something? i still have no idea what a sampling distribution is!
21. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
(Original post by tangkykiet)
That question , a and b , did you use poisson or binomial expansion ?
Yeah i got confused on that, did Poisson first but then changed to Binomial which I'm pretty sure is correct.
22. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
wow the last question i did a really complicated method, but got n=35
we had to work out soo many probabilities
23. Re: S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST
(Original post by JordanS94)
I got n=34 :/
same