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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 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
Most of them is correct. Well done
2. (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
Q6 I got N=57
3. (Original post by Student1408)
i got 225!!!

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

FREEEEEEDOMMMM!)
(Original post by connorbarr)
225 as well
(Original post by LLk1)
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....
Ok, seems like I made a mistake in this big 8 marker...
Did you do normal approximation from binomial to normal?
With the normal approximations having n in it?
I got a quadratic involving n in the end...! Slip or big error?
4. What was the method for question 1a !! I got the answer as -19560 which is obviously wrong - someone please explain lol
5. (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
Yeah same for all except don't remember 3(c)
What was the question for 3 (c)?

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6. looking at these answers, feel like i made a lot of mistakes but oh well, just one left now
7. (Original post by qqa85781521)
Q6 I got N=57
I got n= 177 :'( (or something like that)
8. (Original post by Gilo98)
Should be around 72/75 for me. Make a stupid mistake on a and k question. Found the first simultaneous equation so I imagine there's a mark in that. IIRC correctly it was 4 marks so the other 3 will be dropped. Paper was quite a fair bit easier that I thought it would be. I predict high grade boundaries

Posted from TSR Mobile
yeah, it was easier because most past papers i did had a least more than one hypothesis testing and they had definitions but todays didn't. I hope GB arent too high!
9. (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
for the very last question, did you find that the E(X) was £40 and then said that this was less than the value found in part E?
10. (Original post by Student1408)
i got 225!!!

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

FREEEEEEDOMMMM!)
Last exam FOREVER?!
Are you not going to University then?
11. Think I got like 60 so shouting myself as I don't know whether I've gotten an a or b overall in maths

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12. (Original post by qqa85781521)
Q6 I got N=57
That's probably right, I didn't really understand the question
13. (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
Qu 2d, because n isn't greater than 50 u don't approximate it and so i got 0.2252 (don't remember exactly) is greater than 0.5 and so accept H0 supports statement
14. (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
I agree with all of these, except n=57 on question 6
15. (Original post by fefssdf)
What was the method for question 1a !! I got the answer as -19560 which is obviously wrong - someone please explain lol
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!!
16. What were the values of a, b and k in that question?
17. (Original post by PatBunker)
I agree with all of these, except n=57 on question 6
yeah, it's probably wrong
18. Please vote in the poll http://www.thestudentroom.co.uk/show....php?t=4188821
19. (Original post by M14B)
Last exam FOREVER?!
Are you not going to University then?
Oh yeah lol sorry. LAST EXAM ( for P(X-less than 365 days) lol
20. (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

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