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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. For E(A) I found what E(R) was, and also found what E(R^2) was but then for the answer I put 49pi... but I also wrote down the correct answer somewhere else on my page... how many marks will I lose ?
2. (Original post by Student1408)
Thanks guys, i get it now
Ouch, I ended up doing E(A) = pi*(E(R))^2
3. (Original post by mangoli)
Went alright but was nothing like the past papers. Got stuck on finding k for 20 minutes and decided to move on, how did you guys do it? I got k = 1/(a+21) and couldnt hew another equation in a from it
F(3)=1
F(2)=0

Then simultaneous

Posted from TSR Mobile
4. I got k as 1/19 can someone please put up a solution I didn't know how to do it
5. (Original post by mangoli)
Went alright but was nothing like the past papers. Got stuck on finding k for 20 minutes and decided to move on, how did you guys do it? I got k = 1/(a+21) and couldnt hew another equation in a from it
I done it by integrating and making it equal 1, so working out the area under the graph

then F(3) =1

then simultaneous
6. Someone explain why question 5 was 225
7. How did people get 225? I ended up solving the quadratic p^2 + 0.7p - 55.5 <0 something like that 🙈
8. I got n = 225 and 342.25 or something and i bsed a bit at the end to say it was 225 due to a positive sqrt being needed. I also wrote 225 is a whole number

How did you guys show that it was 225 and not 342.25?
9. Got k wrong (1/4? marks)
Got n for the 8 marker wrong (6/8? marks)
Got E(A) wrong (0/4 marks)

So I am thinking 65/75 or so, not what I wanted, hoping for low grade boundaries.
10. (Original post by iMacJack)
F(3)=1
F(2)=0

Then simultaneous

Posted from TSR Mobile
You don't even need to do simultaneous equations 2a -24 = 0
11. For q3, wasn't it 49π? E(X)=5+9/2=7E(A)= πr^2= 49π
12. (Original post by Student403)
I got n = 225 and 342.25 or something and i bsed a bit at the end to say it was 225 due to a positive sqrt being needed. I also wrote 225 is a whole number

How did you guys show that it was 225 and not 342.25?
I just said that it had to be discrete and a whole number and put 225
13. (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
I dont remember the numbers but you should have written F(2)=0 and F(3)=1.
With the first one k cancels so you can find a and sub it into the second to get k=1/9
14. (Original post by Student403)
I got n = 225 and 342.25 or something and i bsed a bit at the end to say it was 225 due to a positive sqrt being needed. I also wrote 225 is a whole number

How did you guys show that it was 225 and not 342.25?
I put 342.25 as my final answer
15. I just hope there's a lot of method marks 🙃
16. looooooooool flopped that that was hard at least i got n=225 ;-;
17. Can anyone remember the mark structure?
18. Guys what values did you get for a, b and k?
19. (Original post by Music With Rocks)
I put 342.25 as my final answer
I just put 225 in the whole thing and it worked out to get the probability they showed, my friend put both in when u find the z values, and said you get negative z for 342.25 i think? you didn't really have to say why you picked what?
20. (Original post by NamelessPersona)
I just said that it had to be discrete and a whole number and put 225
Oh okay nice

(Original post by Music With Rocks)
I put 342.25 as my final answer
342.25 would only have worked if you took the negative square root of it in the normal distribution expression which i considered but it seemed too specific

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