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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.
(edited 11 years ago)
S2 May 2012 Part1.pdf780.4KB
S2 May 2012 Part2.pdf551.8KB

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Reply 1
Avatar for meraphox
meraphox
Open???


This was posted from The Student Room's iPhone/iPad App
Reply 2
Avatar for meraphox
meraphox
I got n=45 anyone else??


This was posted from The Student Room's iPhone/iPad App
Reply 3
Avatar for amoo94
amoo94
1
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!
Reply 4
Avatar for tangkykiet
tangkykiet
Can you please post the unofficial mark scheme up please ? Im dying to see :frown:
i got 35
Reply 6
Avatar for meraphox
meraphox
Answers??? Please !!!!
I need to knw


This was posted from The Student Room's iPhone/iPad App
Reply 7
Avatar for Legendary
Legendary
1
It's 35 bruddas
Reply 8
Avatar for tangkykiet
tangkykiet
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 ?
(edited 11 years ago)
Yeah, I got n=35.
How did people find it? ****ing Q6 I almost had a heart attack when I saw it :rant:
Most satisfying thing ever subbing in 10 into the TRIPLE PDF to CDF and realising it was 1 <3
Original post by master_blaster66
what did everyone get for the last qustion...the value of n


i got 16 but mine was wrong :frown: 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??
Original post by tangkykiet
That question , a and b , did you use poisson or binomial expansion ?


what was a and b again
I got n=34 :/
Definitely 35 not 38.
Reply 16
Avatar for amoo94
amoo94
1
Original post by JordanS94
How did people find it? ****ing Q6 I almost had a heart attack when I saw it :rant:


was that about a sampling distribution for a range or something? i still have no idea what a sampling distribution is!
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.
Reply 18
Avatar for number23
number23
15
wow the last question i did a really complicated method, but got n=35
we had to work out soo many probabilities :redface:
Original post by JordanS94
I got n=34 :/


same

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