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# Edexcel S2 - 27th June 2016 AM

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1. (Original post by Jellymath)
What is the answer to E(A)? I got 151pi/3 using the formula in the formula book
Got that too
2. What did you all get for the value of n in that big 8 marker normal distribution question?

I got like 124…

Apart from that, good paper.
3. (Original post by thephysio)
What did you all get for the value of n in that big 8 marker normal distribution question?

I got like 124…

Apart from that, good paper.
225

Posted from TSR Mobile

Arithmetic slip in 8 marker drop around 3, ****ed up the last part of the last question = 2 gone, therefore 5 marks dropped that I know of

Posted from TSR Mobile
5. 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
6. Got k wrong so that's 4 gone. Hoping everything else was right.
7. K = 1/9
N=225
Mean was 1.41
Variance 1.44
E(a) was 131pi/5
41.88 pounds then 40 pounds so he shouldn't remove staples
8. i got 225!!!

FLIP yeah!!! last exam forever!!!!!

FREEEEEEDOMMMM!)
9. Answers on my calc stored (not in order)

151/3 pi
0.1516
0.2396 for hypothesis
1/9
225
0.24
0.325 for last question part B
N = 57

Posted from TSR Mobile
10. 225 as well
11. Did you have to do continuity correction for the normal distribution question? I put in 55.5 and got a nice answer of 225, I then tried with just 55 and got not such a nice answer....
12. (Original post by Nikhilm)
Answers on my calc stored (not in order)

151/3 pi
0.1516
0.2396 for hypothesis
1/9
225
0.24
0.325 for last question part B
N = 57

Posted from TSR Mobile
Yep
13. (Original post by Yua)
K = 1/9
N=225
Mean was 1.41
Variance 1.44
E(a) was 131pi/5
41.88 pounds then 40 pounds so he shouldn't remove staples
How did you get 41.88?
14. LOOOOOL.
I just need U+ for an A or A* in maths, and this exam I f***ked it up. Well, I think I got a C or B, which is enough to get an A or A* in maths 😂😂😂😂
15. 0.24 for variance on q7?
16. (Original post by Mattematics)
What did people put for the last question? My expected was £41 something and he'd get £40 removing so I said no.
same here!!
17. (Original post by Yua)
0.24 for variance on q7?
Yep
18. 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
19. (Original post by Yua)
0.24 for variance on q7?
Yep got that
20. (Original post by Supermanxxxxxx)
Yeah same my probability was so high like 0.2 or something like that
Posted from TSR Mobile
Yeah same but i did it like four times so hopefully its correct

(Original post by Nikhilm)
N= 57, n= 225, E(A) = 151/3 pi

Agree?
Posted from TSR Mobile
Yeah i got that too yaaaay

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