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Edexcel S2 - 27th June 2016 AM watch

  • 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%

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    (Original post by Student1408)
    Its basically sum of fx /divided my the sum of f

    and for variance its E(X^2)- (E(X))2. meaniing the sum of fx^2 insead.

    That sounds confusing lol but its usually in s1 but they put it on s2.

    Hope that helps!!
    oh my god - is this from S1 lol.. seems I completely forgot how to do this !!! oops ... will I get a mark for using the variance formula even though my E(X) and E(X^2) were wrong . dammit edexcel asking S1 in S2 !!!
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    (Original post by M3WIZARD)
    Question 1a) U = 1.44 Var(x) = 1.44 (3 Marks)b) U was approximately Variance (1 Mark)c) I – 0.251 II – 0.777 (4 Marks)d) 0.1378 (3 Marks)e) 0.152 (3 Marks) (Might be 0.132 – Rushed this onmy copy of answers) Question 2a) N=60 (2 Marks)b) I – 0.0133 II -0.0159 (5 Marks)c) 0.2396>0.01 Keep H0 (5 Marks)Question 3a) f(x) = ¼ 5=<R=<9 , 0 otherwise (1 Marks)b) 0.5 (1 Marks)c) 158.13 (4 Marks)Question 4a) Show that (6 Marks)b) K = 1/9 (4 Marks)Question 5 N = 225(I applied continuity correction – I honestly didn’t know if I should) (8Marks)Question 6a) 9 samples (2 Marks)b) 4 = ¼ , 5 = 3/10 , 6= 29/100 , 7 = 3/25, 8 =1/25 (5 Marks)c) N=57 (3 Marks)Question 7a) 1.2 (4 Marks)b) 0.24 (4 Marks)c) 0.325 (3 Marks)d) £41.88 (2 Marks)e) Shouldn’t remove staples (2 Marks) I’m not claiming these are all right – let me know J These are what I wrote
    Got exactly the same
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    Was the answer 1.41 for the mean in the first question?
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    Anyone remember the marks for question 1. I made silly mistake in the beginning.
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    (Original post by PatBunker)
    I agree with all of these, except n=57 on question 6
    Q3b) is not 0.75, 10 is outside the boundary so 7<X<9 is 0.5
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    I really flopped this exam.. Found it way worse than c4 and c3
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    (Original post by fefssdf)
    oh my god - is this from S1 lol.. seems I completely forgot how to do this !!! oops ... will I get a mark for using the variance formula even though my E(X) and E(X^2) were wrong . dammit edexcel asking S1 in S2 !!!
    Lol, yeah when i saw it, i was like wth but then thankfully my brain figured that out
    umm not sure but you might get method marks but not entirely sure.

    Hope that helps
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    (Original post by Piers456)
    What was Q3 about?
    uniform distribution for the radius of a circle R
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    (Original post by SHJBHB)
    Q3b) is not 0.75, 10 is outside the boundary so 7<X<9 is 0.5
    I agree
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    That paper was an absolute myth ****ed that up so hard gdbye 1st choice uni
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    Can someone please explain E(A), as i got it to equal 49pi.

    E(R) = (9+5)/2
    E(R) = 7

    E(A) = pi * 7^2
    E(A) = 49pi
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    For the 8 marker I got n=87 but I think I messed up when hiding the quadratic how many marks do you think Tisi Weill be


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    [QUOTE=Supermanxxxxxx;66136137]For the 8 marker I got n=87 but I think I messed up when findingthe quadratic how many marks do you think I'll get







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    grade boundary predictions? I got somewhere between 62-70 and need 80UMS in this exam
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    How many marks was it to find the sample distribution of the other means?
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    (Original post by hwilkoo)
    Can someone please explain E(A), as i got it to equal 49pi.

    E(R) = (9+5)/2
    E(R) = 7

    E(A) = pi * 7^2
    E(A) = 49pi
    same i got that but i think its wrong. was 4 marks aswell!
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    (Original post by hwilkoo)
    Can someone please explain E(A), as i got it to equal 49pi.

    E(R) = (9+5)/2
    E(R) = 7

    E(A) = pi * 7^2
    E(A) = 49pi
    I got this too
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    (Original post by hwilkoo)
    Can someone please explain E(A), as i got it to equal 49pi.

    E(R) = (9+5)/2
    E(R) = 7

    E(A) = pi * 7^2
    E(A) = 49pi

    thats exactly what I did !
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    (Original post by M3WIZARD)
    Question 1a) U = 1.44 Var(x) = 1.44 (3 Marks)b) U was approximately Variance (1 Mark)c) I – 0.251 II – 0.777 (4 Marks)d) 0.1378 (3 Marks)e) 0.152 (3 Marks) (Might be 0.132 – Rushed this onmy copy of answers) Question 2a) N=60 (2 Marks)b) I – 0.0133 II -0.0159 (5 Marks)c) 0.2396>0.01 Keep H0 (5 Marks)Question 3a) f(x) = ¼ 5=<R=<9 , 0 otherwise (1 Marks)b) 0.5 (1 Marks)c) 158.13 (4 Marks)Question 4a) Show that (6 Marks)b) K = 1/9 (4 Marks)Question 5 N = 225(I applied continuity correction – I honestly didn’t know if I should) (8Marks)Question 6a) 9 samples (2 Marks)b) 4 = ¼ , 5 = 3/10 , 6= 29/100 , 7 = 3/25, 8 =1/25 (5 Marks)c) N=57 (3 Marks)Question 7a) 1.2 (4 Marks)b) 0.24 (4 Marks)c) 0.325 (3 Marks)d) £41.88 (2 Marks)e) Shouldn’t remove staples (2 Marks) I’m not claiming these are all right – let me know J These are what I wrote
    Agree with all. I can't remember what 1)c)i) was but presumably if I got part ii right I got i right also. Only thing I got wrong was k.

    Happy days
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    (Original post by AJC1997)
    grade boundary predictions? I got somewhere between 62-70 and need 80UMS in this exam
    it will drop down this year - I would say 62 maybe even 60 for an A as this was SO much harder than the 2015 paper
 
 
 
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