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# Edexcel S2 - 27th June 2016 AM

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1. (Original post by NamelessPersona)
23 UMS
(Original post by Student403)
23
cheers haha thats jokes now I don't care that i messed up this exam
2. (Original post by cheesedrew)
for area of circle
A=PI(r^2)
E(A)=PI * E(R^2)

e(R) = 7 (9+5 / 2 =7)
e(R^2) integrate R/4 *R^2

r^4/16 (limits 9 and 5)
9^4/16 - 5^4/16 =371 therefore E(R^2)= 371
area then is 371* PI

my thoughts
You didn't need to integrate, you could just use (b-a)^2/12 which gives 16/12 = 4/3
3. (Original post by Rey Mysterio)
cheers haha thats jokes now I don't care that i messed up this exam
congrats mate
4. 70/75 prediction? A*?

Posted from TSR Mobile
5. 1) 1.41, 1.4419, 0.2510, 0.7769, 0.1378, 0.1516

2) 60, 0.0133, 0.0159, 0.2396

3) 0.5, 151pi/3

4) B = 8, A = -12 (didn't need this), k = 1/9

5) 225 (i got 342.25 too but put 225 as my final answer. Not sure of the correct reason)

6) 9 samples, 0.25(4), 0.3(5), 0.29(6), 0.12(7), 0.04(8) n = 57

7) mean 1.2, var 0.24, prob 0.325, 41.88GBP, no he should not remove staples
6. (Original post by iMacJack)
70/75 prediction? A*?

Posted from TSR Mobile
Should be, might be 90 ums exactly considering that 71 was 90 last year
7. (Original post by jonnypdot)
can some one please write the function for the last questions please
I THINK that it was something like:

f(x) = (9x-3x^2)/10, for 0<x<2;
0, otherwise.
8. Can someone show how to fully work out Q4 A and Q5 please
9. how many marks do you think id lose if I put n=56 instead of 57, do you think I'd get any??
10. (Original post by Student403)
1) 1.41, 1.4419, 0.2510, 0.7769, 0.1378, 0.1516

2) 60, 0.0133, 0.0159, 0.2396

3) 0.5, 151pi/3

4) B = 8, A = -12 (didn't need this), k = 1/9

5) 225 (i got 342.25 too but put 225 as my final answer. Not sure of the correct reason)

6) 9 samples, 0.25(4), 0.3(5), 0.29(6), 0.12(7), 0.04(8) n = 57

7) mean 1.2, var 0.24, prob 0.325, 41.88GBP, no he should not remove staples
not bad at all for 2 hours of revision
11. (Original post by Student403)
there was no 90 UMS last year. 92 UMS was 71, 88 UMS was 70.

Scaling is weird sometimes
yeah it is, I just assume that an A* boundary is 90 UMS and you needed 71 for an A*
12. (Original post by NamelessPersona)
yeah it is, I just assume that an A* boundary is 90 UMS and you needed 71 for an A*
Actually I deleted my post cause I was wrong lol - 90 UMS was exactly 71. Not sure where I got 92
13. (Original post by Ayman!)
not bad at all for 2 hours of revision
I guess not lol

Cheers for the summarised notes! <3
14. (Original post by Student403)
Actually I deleted my post cause I was wrong lol - 90 UMS was exactly 71. Not sure where I got 92
UMS scaling is still weird though
15. Anyone remember how much the finding k part of the question was worth? I got a as 11 which I think was wrong so I got the wrong answer for k... wondering how much I would've lost
16. (Original post by mupsman2312)
I THINK that it was something like:

f(x) = (9x-3x^2)/10, for 0<x<2;
0, otherwise.
what was the awnser for var(x) do you find e(x^2)-(e(x))^2
17. (Original post by NamelessPersona)
UMS scaling is still weird though
Yeah for sure
18. What would 56 marks be in UMS?

Posted from TSR Mobile
19. For the N=225 8 marker I got to the equation then couldn't solve for N so I used trial and error and got 225, would I lose marks? If so how many?
20. Urghhhh, for Q5) I got N = 223 because I missed out the continuity correction How many marks do you reckon this would lose?! I'm positive I did everything else right, including rejecting the wrong root!

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