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# Edexcel S2 - 27th June 2016 AM Watch

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1. (Original post by the-anonymous-me)
Does anyone remember how many marks the area of the circle question was??
4 marks
2. (Original post by qqa85781521)
Q6 I got N=57
Same here!
3. Got literally everything wrong bye university

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4. If i got 93, 93, 91 last year and assuming I got 180 from c3/c4, how much ums would I need for an A*?
5. how did you do the hypothesis question?
6. for area of circle
A=PI(r^2)
E(A)=PI * E(R^2)

e(R) = 7 (9+5 / 2 =7)
e(R^2) integrate R/4 *R^2

r^4/16 (limits 9 and 5)
9^4/16 - 5^4/16 =371 therefore E(R^2)= 371
area then is 371* PI

my thoughts
7. (Original post by NamelessPersona)
Dont worry I messed up on it and forgot to multiply my a by 3, only realised 10 mins after exam
If you don't mind, did you solve the "bin" question? The expected price per full bin or something, I got the right answer but I still don't understand cuz initially I thought I need to use E(X) which is the expected value of staples and I don't see why that's wrong
Actually I wrote down both answers so examiner can decide... lol
8. (Original post by Rey Mysterio)
If i got 93, 93, 91 last year and assuming I got 180 from c3/c4, how much ums would I need for an A*?
23
9. (Original post by Rey Mysterio)
If i got 93, 93, 91 last year and assuming I got 180 from c3/c4, how much ums would I need for an A*?
23 UMS
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. (Original post by angelitajin)
If you don't mind, did you solve the "bin" question? The expected price per full bin or something, I got the right answer but I still don't understand cuz initially I thought I need to use E(X) which is the expected value of staples and I don't see why that's wrong
Actually I wrote down both answers so examiner can decide... lol
http://www.thestudentroom.co.uk/show...9#post66137149
12. In the Sampling Question, what did everyone get for the last part where it said find the MINIMUM VALUE OF N ???
13. How do you prove b=8?
14. (Original post by buci98)
f**k you
dude don't quote him. His post will get removed soon

Edit your post now and remove the quote
15. (Original post by Danllo)
In the Sampling Question, what did everyone get for the last part where it said find the MINIMUM VALUE OF N ???
57
16. (Original post by Dannyfire)
How do you prove b=8?
Differentiate CDF twice and equate to 0 , subbing in x=8/3
17. (Original post by NamelessPersona)
57
Wasn't it 56 ???
18. (Original post by Danllo)
Wasn't it 56 ???
ln(0.1)/ln(0.96) < n
56.4 < n
n = 57
19. (Original post by lara24)
I got k as 1/19 can someone please put up a solution I didn't know how to do it
Am I the only one who got that k = 1/40?
20. can some one please write the function for the last questions please

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