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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%

1. (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 !!!
2. (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
3. Was the answer 1.41 for the mean in the first question?
4. Anyone remember the marks for question 1. I made silly mistake in the beginning.
5. (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
6. I really flopped this exam.. Found it way worse than c4 and c3
7. (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
8. (Original post by Piers456)
What was Q3 about?
uniform distribution for the radius of a circle R
9. (Original post by SHJBHB)
Q3b) is not 0.75, 10 is outside the boundary so 7<X<9 is 0.5
I agree
10. That paper was an absolute myth ****ed that up so hard gdbye 1st choice uni
11. 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
12. 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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13. [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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14. grade boundary predictions? I got somewhere between 62-70 and need 80UMS in this exam
15. How many marks was it to find the sample distribution of the other means?
16. (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!
17. (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
18. (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 !
19. (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
20. (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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