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# Edexcel S2 - 27th June 2016 AM

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
• View Poll Results: How did you find the Edexcel S2 exam?
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331
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293
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152
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Very easy
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1. (Original post by TheSammy2010)
My answers, idk if they are right

Q1,
Mean= 1.41
Variance= 1.4419
Probabilities; 0.7769, 0.1378, 0.1516

Q2,
N=60
0.0133
0.0159
Do not reject Ho (using binomial tables)

Q3,
0.75
151π/3

Q4,
K=1/9

Q5,
N=225

Q6,
P(M=5)= 0.3
P(M=6)= 0.29
P(M=7)= 0.12

N=11

Q7,

Mean= 1.2
Var= 1.92
P(X>3)= 0.3250
£41.88 per bin

He shouldn't as the mean profit of bins would be £40
2. (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 !!!
3. (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
4. Was the answer 1.41 for the mean in the first question?
5. Anyone remember the marks for question 1. I made silly mistake in the beginning.
6. (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
7. I really flopped this exam.. Found it way worse than c4 and c3
8. (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
9. (Original post by Piers456)
uniform distribution for the radius of a circle R
10. (Original post by SHJBHB)
Q3b) is not 0.75, 10 is outside the boundary so 7<X<9 is 0.5
I agree
11. That paper was an absolute myth ****ed that up so hard gdbye 1st choice uni
12. 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
13. 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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14. [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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15. grade boundary predictions? I got somewhere between 62-70 and need 80UMS in this exam
16. How many marks was it to find the sample distribution of the other means?
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
same i got that but i think its wrong. was 4 marks aswell!
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
I got this too
19. (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 !
20. (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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