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# Edexcel S2 - 27th June 2016 AM

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• View Poll Results: How did you find the Edexcel S2 exam?
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1. I just took a SS of my answers in word - I can't figure out how to formatt on this reply box! XD Here is a neater version of what I wrote - Please Tell Me if I got any wrong.
EDIT: For Q1 a) I wrote 1.44 for the mean - This is just a typo - I actually wrote 1.41. Which seems right.
2. Please may someone explain question 3b (the circle one) to me
(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
3. (Original post by Vlad Murzakov)
For q3, wasn't it 49π? E(X)=5+9/2=7E(A)= πr^2= 49π
No, you had to use E (R^2), by doing variance + mean squared, then times your answer by pi
4. (Original post by NamelessPersona)
I wouldn't think so but I'm not entirely sure

Edit: oops misread what you rounded to, yeah I think you would lose a mark
Thanks, no idea how I managed it!
5. A=(pi)(r^2)
So find E(r^2) and times by pi
6. (Original post by M3WIZARD)
I just took a SS of my answers in word - I can't figure out how to formatt on this reply box! XD Here is a neater version of what I wrote - Please Tell Me if I got any wrong.
I think the mean in Q1 was 1.41 and I can't remember what I got for 3c, but the rest was the same I think.

Edit: Got the same for 3c, i just left it in terms of pi
I also messed up k, by forgetting that a was multipied by 3, so I got 1/33 instead.
7. (Original post by M3WIZARD)
I just took a SS of my answers in word - I can't figure out how to formatt on this reply box! XD Here is a neater version of what I wrote - Please Tell Me if I got any wrong.
The mean was 1.41 not 1.44 but I agree with everything else.
8. (Original post by M3WIZARD)
I just took a SS of my answers in word - I can't figure out how to formatt on this reply box! XD Here is a neater version of what I wrote - Please Tell Me if I got any wrong.
Mean was 1.41 but everything else right

Posted from TSR Mobile
9. (Original post by Mattematics)
The mean was 1.41 not 1.44 but I agree with everything else.
Whoops yeah I wrote 1.41 IDK this document I wrote 1.44 aha - so 100%? I need 91/100 UMS for an A*
10. (Original post by Kevinwong)
Question 2 the hypothesis test was 0.2236 which is more than 0.01 therefore accept null hypothesis

Question 3 it was 0.5 not 0.75

Question 4 n was 57

Rest are right

Posted from TSR Mobile
I got 0.2236 for the actual test but i put the probabilities for the previous parts as well
11. Can anyone explain me how to find k value? Somehow I managed to prove b=8 but I couldn't find k value funny
12. (Original post by angelitajin)
Can anyone explain me how to find k value? Somehow I managed to prove b=8 but I couldn't find k value funny
F(3) = 1
F(2) = 0
Use simultaneous eqns
13. What does everyone think 90 ums will be?
14. What were questions 1c-E?
15. (Original post by lukejoshjames)
What does everyone think 90 ums will be?
Similar to last year, id say around 71 marks. Maybe a bit lower?
16. (Original post by NamelessPersona)
F(3) = 1
F(2) = 0
Use simultaneous eqns
Oh...!!!!! Now I feel like an idiot it was actually very simple! :0 Thanks
17. I made up the value for a in Q4, will I get follow through marks for working out K?
18. (Original post by NamelessPersona)
F(3) = 1
F(2) = 0
Use simultaneous eqns
We also know that P(X<2)=0, so instead of F(3)=1, I used F(1)=0 and got the wrong "a" and "k"
19. (Original post by angelitajin)
Oh...!!!!! Now I feel like an idiot it was actually very simple! :0 Thanks
Dont worry I messed up on it and forgot to multiply my a by 3, only realised 10 mins after exam
20. Does anyone remember how many marks the area of the circle question was??

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