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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?
Very hard
145
14.71%
Hard
331
33.57%
Normal
293
29.72%
Easy
152
15.42%
Very easy
65
6.59%

1. Did anyone else use simultaneous equations to find the value of k (and of course a being needed for that).

One of the simultaneous equations I used F(lower boundary)=0
and the other I believe I did F(upper boundary)=1 or something like that

Got k=1/9
2. hardest s2 paper EVER
3. (Original post by igotohaggerston)
How many marks was the P(7<R<10) question
It was certainly 1 mark
4. (Original post by thephysio)
Did anyone else use simultaneous equations to find the value of k (and of course a being needed for that).

One of the simultaneous equations I used F(lower boundary)=0
and the other I believe I did F(upper boundary)=1 or something like that

Got k=1/9
Yeah I got k as 1/9
5. (Original post by thephysio)
I've done something very similar to you but I appear to have made a silly mistake, resulting in an answer of 124 or something from my quadratic formula. What do you think I might have lost in terms of marks?

Yes, I took ln of both sides and it appears I got the right answer, hope this is an OK method to use.. should be given that S2 is usually taught alongside A2 maths which includes ln in C3 and C4.
well if you got n wrong that means you got the wrong values for square root n which means the wrong equation.
if you got mean and variance right in terms of n thats one mark
if you got the continuity correct the thats one mark
if you got a correct equation in terms of n thats one mark
if you got the right n values thats one mark
if you got 0.9599 and value of 1.75 then thats one mark
i am not sure or last mark it is a 6 mark q.
so i think you might have lost 3.
6. Anyone feel uncertain when they look at Q2 last part on hypothesis test ? the probability is like 0.2 given the significance level is 1%, that's a huge difference, in the past papers it was usually only little above or below significance level.
7. (Original post by cogito.)
Anyone feel uncertain when they look at Q2 last part on hypothesis test ? the probability is like 0.2 given the significance level is 1%, that's a huge difference, in the past papers it was usually only little above or below significance level.
Yep, esp. since 1% is less then the more common 5%
8. There was a question on sampling distribution of the mean right?
9. (Original post by Johnny98)
There was a question on sampling distribution of the mean right?
Yes
10. (Original post by EricPiphany)
Yep, esp. since 1% is less then the more common 5%
The calculated probability was about 20%, not even near the usual 5% significance level. I've never seen a question like this before, and I generally thought the question is wrong and tried other numbers above 50
11. (Original post by cogito.)
Anyone feel uncertain when they look at Q2 last part on hypothesis test ? the probability is like 0.2 given the significance level is 1%, that's a huge difference, in the past papers it was usually only little above or below significance level.
ye thats what i am saying i got 23.69%
but i think thats right as p=0.05 and n=50 if you find e(x) you get 2.5 and it asks for >4 so it kinda logical to get a high probability. but at 1% significance thats weird it should have said at least 10%
12. (Original post by cogito.)
The calculated probability was about 20%, not even near the usual 5% significance level. I've never seen a question like this before, and I generally thought the question is wrong and tried other numbers above 50
n > 50 would've just made matters worse
13. there were much harder papers than this
100-75
A*-70
A-67,68
B-58
14. (Original post by ISAAQAHELP)
well if you got n wrong that means you got the wrong values for square root n which means the wrong equation.
if you got mean and variance right in terms of n thats one mark
if you got the continuity correct the thats one mark
if you got a correct equation in terms of n thats one mark
if you got the right n values thats one mark
if you got 0.9599 and value of 1.75 then thats one mark
i am not sure or last mark it is a 6 mark q.
so i think you might have lost 3.
Thank you!
Did you use ln to find that value of something?
15. (Original post by ISAAQAHELP)
there were much harder papers than this
100-75
A*-70
A-67,68
B-58
You clearly don't understand grade boundaries.
16. what was q6 about again
17. (Original post by hsjsh)
You clearly don't understand grade boundaries.
are you joking A better be 50 or im screwed
18. (Original post by thephysio)
Thank you!
Did you use ln to find that value of something?
Ye
i got something like n(ln(24/25))<ln0.1
and now since ln(24/25) is negative you divide by that and the sign flips over
n>56.405....
and you get n=57
19. (Original post by ISAAQAHELP)
Ye
i got something like n(ln(24/25))<ln0.1
and now since ln(24/25) is negative you divide by that and the sign flips over
n>56.405....
and you get n=57
Oh damn, I used equals sign and backthought it to get n=57.
20. (Original post by stephaniechan)
are you joking A better be 50 or im screwed
lol look at june 15 it was kinda harder on q5d and this paper was ok compared to that.
and all other papers have like average 60 as A

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