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# Edexcel S2 - 27th June 2016 AM

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
• 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 ShowMeUnofficial)
Could someone link me the unofficial scheme?
http://www.thestudentroom.co.uk/atta...1&d=1467024133
2. (Original post by AlexFrangos)
Sure. How did you find the paper?

I think its pretty easy. I just spent 45 minutes to finish the paper.

The only thing I'm not sure about is the question concerning car test, i dun know if its talking about 20 cars or 54 cars.
3. For the normal approximation question i forgot to use sq rt of np(1-p). how many marks do you think i lost?
4. Isn't Q1 E(X) is about 1.41?
5. Who else thought question 8 was quite cute?
6. (Original post by hank_the_tank)
I think its pretty easy. I just spent 45 minutes to finish the paper.

The only thing I'm not sure about is the question concerning car test, i dun know if its talking about 20 cars or 54 cars.
I made a mistake in the critical region question, i found X>=11 rather X>=9 and so the next parts of that question went wrong. Do you think i will lose all the marks in that question?
7. (Original post by cogito.;[url="tel:66151095")
66151095[/url]]Isn't Q1 E(X) is about 1.41?
Yeah it is 1.41, that's the only mistake that was made on the answers
8. Honestly why does the poll suggest people found it hard? This was an average S2 paper and probably it will be like 70 for an A*
9. If you round the probability answers to 4dp will you lose marks. Eg, 0.3783889 and u put final answer as 0.3784 to 4 dp. Will this be wrong ?
10. (Original post by Danllo)
If you round the probability answers to 4dp will you lose marks. Eg, 0.3783889 and u put final answer as 0.3784 to 4 dp. Will this be wrong ?
If you're ever stuck or wanting to try and mark your answers in the style of an examiner, check past papers for a similar question, what kind of values/dp/method etc they want. You'll never see a question requiring you to give an answer to 7 dp because that implies a level of accuracy that isn't there.

(Take from that what you will - what you've done is the right answer, but I am also telling you how to answer your own questions in the future )
11. (Original post by fpmaniac)
I got 0.2n^2 (plus or minus cant remember) root(0.16n) + something

But I got a different value from 225 I got two hundred and something
But it was an 8-marker, though - not 6...
12. (Original post by cogito.)
Isn't Q1 E(X) is about 1.41?
I got that too
13. (Original post by EricPiphany)
Who else thought question 8 was quite cute?
I thought it was nice. Got the answer quite swiftly.
14. (Original post by SB0073)
Would I get any marks for this?! Question 5) Normal approx...X~B(n,0.2)E(X)=0.2nVar( X)=0.16ntherefore; X~N(0.2n,0.16n) P(X>55)=> CC P(X>=55.5)P(Z>(55.5-0.2n)/rt0.16n)=0.04011-P(Z<(55.5-0.2n)/rt0.16n)=0.0401P(Z<(55.5-0.2n)/rt0.16n)=0.9599Therefore;(55.5-0.2n)/rt0.16n = 1.7555-0.2n= 1.75(0.4)(n^1/2)55-0.2n=0.7n^1/2Then I squares out formed a quadratic and tried to rearrange but it didn't solve (yielded imaginary numbers) How many marks out of 8 would I get if any? Was I on the right lines or have I lost the plot.
You were definitely doing it right - I'd probably say about 5 or 6 out of 8 for all of that!
15. (Original post by Funnycatvideos)
I thought it was nice. Got the answer quite swiftly.
There wasn't a question 8... Are you talking about question 7 - the one about the staples?
16. (Original post by Funnycatvideos)
I thought it was nice. Got the answer quite swiftly.
It was straightforward if you were prepared for it.
17. (Original post by mupsman2312)
There wasn't a question 8... Are you talking about question 7 - the one about the staples?
I thought he was on about the normal approximations one. I don't really know what was on my mind. I think fasting and hay-fever is getting to me
18. (Original post by Funnycatvideos)
I thought he was on about the normal approximations one. I don't really know what was on my mind. I think fasting and hay-fever is getting to me
lol, why do you do that to yourself... please don't starve yourself...
19. (Original post by mupsman2312)
You were definitely doing it right - I'd probably say about 5 or 6 out of 8 for all of that!
It's seriously so frustrating I don't know where I went wrong? Can you spot where? 5 or 6 thank god!
20. Grade boundary predictions anyone? I thought it was more difficult than last year...

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