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# Edexcel S2 - 27th June 2016 AM

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
• View Poll Results: How did you find the Edexcel S2 exam?
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145
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331
33.57%
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293
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152
15.42%
Very easy
65
6.59%

1. The E(A) question, i thought you need to imtegrate Pi x R^2 r cus that's in the formula :'(
So you get like intergrate of Pi x r x 1/16 dr, not Pi x r square x 1/4
I got 3pi/4 for that
But well how many marks was that question??
And the find n part, i got 1.75=(55.5-0.2n)/squareroot 16n
I multiplied them out and got b^2- 4ac as negative and im confused :'(
Does anyone remember how much the radius question was worth?
It was worth 4 marks.
3. (Original post by Armpits)
If you're wrong we will have problems.
I will have problems as well - I need at least a B on this to get my A in maths arghhh
what I would say is that the normal approximation question would've confused a lot of people, the integration thing for 6 marks as well would've led to lots of silly mistakes, and then the weird circle question would've confused people... there were enough ' dodgy' questions to make me think boundaries won't be as extortionate as 2015. Also there were a few S1 type questions, and I like many people would've forgot how to find the mean and variance when given the table... and that was question 1a !
4. (Original post by fefssdf)
ah yeh thanks for reminding me what the values were, and yeh that was the correct method... It was out of 4 so it would be M1 for the first equation so for F(2)=0 and then M1 for the second equation in terms of K, and then another mark for isolating out K on its own, and then the final A1 for solving for K. So you should get 2/4 if your two equations in terms of K were correct
Thanks! I honestly can't remember how I managed to get 2/3... Although that may be because the equations were incorrect. If that's the case, even if I still have F(2) is zero and F(3) is one, do I get zero? Or can I get a mark just for saying F(2) is zero and F(3) is one? Any opinions? Sorry for bugging you so much 😅
5. Crap for part 7c worked out p(X<1.5)!!! Then got parts d and e wrong as a result. Any ideas how many marks I will loose??
6. Anyone who did S2 ial?
7. Anyone know if there a past paper with a similar question to Q5. ?
Guys, wasn't the E(X) question 53 pi? Because it's the E(X) of a normal distribution so b-a)/2? Where b=81 pi and a=25 pi?
No it wasn't that simple. (b+a)/2 only applies for a uniform continuous. When you have E(A) that is effectively pi*E(R^2) which is not a uniform continuous distribution since you have the R squared.
Thanks! I honestly can't remember how I managed to get 2/3... Although that may be because the equations were incorrect. If that's the case, even if I still have F(2) is zero and F(3) is one, do I get zero? Or can I get a mark just for saying F(2) is zero and F(3) is one? Any opinions? Sorry for bugging you so much 😅

No need to apologising - its the holiday and I'm perfectly satisfied spending countless hours discussing exams haha !
I'm pretty sure you would get M1 for using the fact that F(2)=0 and F(3)= 1, and also bare in mind that if you got some sort of equation and used it to find K then you may pick up a method mark ! fingers crossed for you mate hahah
10. (Original post by taichingkan)
No it wasn't that simple. (b+a)/2 only applies for a uniform continuous. When you have E(A) that is effectively pi*E(R^2) which is not a uniform continuous distribution since you have the R squared.
Yeah, just came on TSR and realised my mistake 😅 Do you think any working out marks are possible here or did I lose all 4?
11. (Original post by Student403)
*takes a screenshot for August*
I do think it has got to go down I mean even the final question with Peter and his bins would've confused some people as people assume its more difficult than it actually is, given its at the end of the paper *prays*
Yeah, just came on TSR and realised my mistake 😅 Do you think any working out marks are possible here or did I lose all 4?
Unfortunately I think all 4 cause that was a major concept error, not a careless mistake... Sorry
13. Really small question you guys- for the beginning of the paper, for justifying they cherry thing as being Poisson, could you discuss the idea that the cherries could be found in certain frequencies at a constant rate? Or they were found independently/randomly? Thanks!
14. (Original post by taichingkan)
Unfortunately I think all 4 cause that was a major concept error, not a careless mistake... Sorry
No worries. What do you think 66/75 would be in terms of UMS?
15. (Original post by taichingkan)
No it wasn't that simple. (b+a)/2 only applies for a uniform continuous. When you have E(A) that is effectively pi*E(R^2) which is not a uniform continuous distribution since you have the R squared.
What was the answer you got for that, i got 3pi/4 cus i integrate pi R square r, which is (pi r )/16
Is that wromg
16. (Original post by taichingkan)
No it wasn't that simple. (b+a)/2 only applies for a uniform continuous. When you have E(A) that is effectively pi*E(R^2) which is not a uniform continuous distribution since you have the R squared.
hey for this question, I correctly found what E(R) and E(R^2) was and I even wrote the correct answer for E(A) but I underlined my other incorrect E(A) which was 49pi... do you think I'd still get like 3/4 cause I had all the correct working but just my final answer wasn't correct ?
17. Lol of all the things to slip up on I got the variance in the first question wrong. All right other that that it looks like, beaming.
18. Was the answers like (151/3)pi
No worries. What do you think 66/75 would be in terms of UMS?
Well according to 2015 boundaries that would be like 79ums, but considering boundaries will likely drop I would say you're gonna get about 82-85 for that... thats me being optimistic so don't come crying to me on results day hahah !
20. (Original post by DesignPredator)
yeh

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