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Edexcel S2 - 27th June 2016 AM Watch

  • View Poll Results: How did you find the Edexcel S2 exam?
    Very hard
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    14.71%
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    293
    29.72%
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    152
    15.42%
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    (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
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    (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
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    (Original post by Rey Mysterio)
    cheers haha thats jokes now I don't care that i messed up this exam
    congrats mate
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    70/75 prediction? A*?


    Posted from TSR Mobile
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    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
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    (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
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    (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.
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    Can someone show how to fully work out Q4 A and Q5 please
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    how many marks do you think id lose if I put n=56 instead of 57, do you think I'd get any??
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    (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
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    (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*
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    (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
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    (Original post by Ayman!)
    not bad at all for 2 hours of revision
    :rofl: I guess not lol

    Cheers for the summarised notes! <3
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    (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
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    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
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    (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
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    (Original post by NamelessPersona)
    UMS scaling is still weird though
    Yeah for sure
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    What would 56 marks be in UMS?


    Posted from TSR Mobile
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    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?
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    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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