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# Edexcel S2 - 27th June 2016 AM

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• View Poll Results: How did you find the Edexcel S2 exam?
Very hard
145
14.71%
Hard
331
33.57%
Normal
293
29.72%
Easy
152
15.42%
Very easy
65
6.59%

1. (Original post by fefssdf)
for K you had to use the fact that F(3) = 1, and that F(2)= 0 so then you ended up with two equations in terms of a,b, and K, and then you used these to isolate out K on its own and then just solved for it ? so K was 1/9
You could've also used the fact that the area of the pdf is equal to 1 for the simultaneous equation, I got 1/9 too.
2. (Original post by SugarCoatedCart)
You could've also used the fact that the area of the pdf is equal to 1 for the simultaneous equation, I got 1/9 too.
ohh yeh
3. (Original post by Honey badger123)
What marks for 100ums?
Pretty sure its never been below 75 for 100
4. (Original post by SugarCoatedCart)
You could've also used the fact that the area of the pdf is equal to 1 for the simultaneous equation, I got 1/9 too.
Well yeah that's the same thing... if the area of the pdf is 1 you're integrating to get the cdf between 3 and 2 which is F(3) - F(2) = 1
5. Anyone with the model answers for the ial s2 paper
6. can't think of anything i got wrong (perhaps 6 part c i put 57 instead of 56) otherwise everything i put down was the same as people i have spoken to.

So i think minimum 72/75 (including random mistakes)

7. (Original post by dnpnstn)
4 marks

I'd guess one for using E(R) to find E(A), two for finding E(R^2), one for accuracy of the answer
You get nothing for using E(R) . Don't lie to yourself.
8. I thought the paper was quite tough.
9. Are there any model answers out yet?
10. (Original post by SB0073)
Would I get any marks for this?! Question 5) Normal approx...X~B(n,0.2)E(X)=0.2nVar( X)=0.16ntherefore; X~N(0.2n,0.16n) P(X>55)=> CC P(X>=55.5)P(Z>(55.5-0.2n)/rt0.16n)=0.04011-P(Z<(55.5-0.2n)/rt0.16n)=0.0401P(Z<(55.5-0.2n)/rt0.16n)=0.9599Therefore;(55.5-0.2n)/rt0.16n = 1.7555-0.2n= 1.75(0.4)(n^1/2)55-0.2n=0.7n^1/2Then I squares out formed a quadratic and tried to rearrange but it didn't solve (yielded imaginary numbers) How many marks out of 8 would I get if any? Was I on the right lines or have I lost the plot.
11. Will I still get an A if I loose 10-12 marks max?
12. (Original post by avi haria)
Anyone with the model answers for the ial s2 paper
apparently nope :/ we are always the ignored ones. Do you still remember your answers?
13. (Original post by tazza ma razza)
can't think of anything i got wrong (perhaps 6 part c i put 57 instead of 56) otherwise everything i put down was the same as people i have spoken to.

So i think minimum 72/75 (including random mistakes)

The power was equal to 2(n) n was equal to 28 which multiplied by two was 56. Therefore the answer is 28.
14. (Original post by Al_YG)
The power was equal to 2(n) n was equal to 28 which multiplied by two was 56. Therefore the answer is 28.
How many marks for that q
15. (Original post by Johnny Sins)
Will I still get an A if I loose 10-12 marks max?
possibly
16. (Original post by avi haria)
Anyone with the model answers for the ial s2 paper
How did you find the paper?
17. (Original post by hank_the_tank)
I did!! wanna discuss the answers?
Sure. How did you find the paper?
18. (Original post by fefssdf)
for this question I didn't end up with a quadratic... I had the mean = 0.02n and then variance i had it as 0.16n.. is this wrong ?
you have to divide by sqrt(0.16n) when standardising
19. Would marks be lost for writing 41.90 rather than 41.88? (Question 7d)
20. (Original post by SB0073)
you will get 4/5 marks

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