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# S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST

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1. Okay... For the last question I forgot to minus my value so I got n = 16... Stupid I know! Hopefully I'll get 1/3 for that. And for question six I kinda derped on what range actually meant, but I did range (x) = 1, 1<x<2, 2 and calculated the ales for each. Since I likely calculated them correctly, I just didn't set out my table correctly and I didn't add the two range = 0 values together, ow many marks out of six do you think I will get? I'm hoping at least 2.
2. (Original post by Moiraclaire)
I think 62 for an A.

A lot of people, including myself, made the silly mistake of using a poisson on the last question. But grade boundary people judge on the "quality of performance" not the ease of making a stupid mistake, so the fact that half of candidtates used poisson, losing 8 marks, won't have a massive dent due to the ease of the other questions. Overall, boundaries a little higher than they aim for (60) at 62.
it might not be 75 for 100 UMS, but it has been on nearly every S2 paper for ages, so I think max 74 for 100 UMS.

But the key information was 3 out of 5 Therefore, fixed number of trials, binomial p=0.6.
There are grade boundary people??? I thought it was all calculated based on alll of the marks of the population...
3. hoping for low grade boundaries!

Session 100 90 80 70 60 50 40
Grade A* A B C D E
Jun-01 75 68 60 52 45 38 31
Jan-02 69 63 57 51 45 40 35
Jun-02 72 65 58 51 44 37 30
Jan-03 70 64 58 52 47 42 37
Jun-03 71 64 57 50 44 38 32
Jan-04 73 67 61 55 49 43 38
Jun-04 75 70 64 57 50 44 38
Jan-05 70 63 56 49 43 37 31
Jun-05 75 68 61 54 48 42 36
Jan-06 73 66 59 52 45 39 33
Jun-06 75 71 66 58 50 43 36
Jan-07 75 71 66 58 50 42 34
Jun-07 75 69 63 55 48 41 34
Jan-08 75 69 62 54 46 39 32
Jun-08 75 70 65 58 51 44 37
Jan-09 75 70 65 57 49 41 33
Jun-09 75 69 62 54 46 38 30
Jan-10 75 70 65 57 50 43 36
Jun-10 75 68 62 54 46 38 31
Jan-11 75 72 69 62 55 48 42
Jun-11 75 67 59 50 41 33 25
Jan-12 75 70 66 60 54 48 43
5. Should have gotten an A..

... too many silly mistakes = a C.
6. ok in question 8 part a i did both poisson and binomial and i left all the answers there and didnt cross anything out. for part b i did binomial but i think i done that wrong cos i got n is 16. on mark schemes it says that marking should be done 'positively' and it said that examiners cant take marks away cos the candidates did something stupid(like putting two different answers?) so i wanna just double check if what i done still gets me marks or would they just say this guy is taking the piss and give me 0 lol
7. i was surprised there was no definition questions, which im happy about
To be perfectly honest, it wouldn't be uniformly distributed at all. He's much less likely to post during early hours of the morning as it's likely he'll be asleep. It thus upsets me you suggested such a model.
Pretty much the same with every s2 question.
Like the length of a call at a call centre (likely to be really short or long)
Cutting a piece of string (if it's near to either edge someone's gunna lose a finger)
I think the idea of them is just generally stupid
9. (Original post by master_blaster66)
i was surprised there was no definition questions, which im happy about
Me too
10. (Original post by aaronbenham)
Pretty much the same with every s2 question.
Like the length of a call at a call centre (likely to be really short or long)
Cutting a piece of string (if it's near to either edge someone's gunna lose a finger)
I think the idea of them is just generally stupid
I happen to be an expert string cutter and I am disgraced by your lack of knowledge on the subject. I'll have you know i once cut a 20cm length of string into 0.0000001cm parts!

Yeah, I LOL'd inside when I saw the q in our paper was on sweet length.... wtf?
11. (Original post by master_blaster66)

Session 100 90 80 70 60 50 40
Grade A* A B C D E
Jun-01 75 68 60 52 45 38 31
Jan-02 69 63 57 51 45 40 35
Jun-02 72 65 58 51 44 37 30
Jan-03 70 64 58 52 47 42 37
Jun-03 71 64 57 50 44 38 32
Jan-04 73 67 61 55 49 43 38
Jun-04 75 70 64 57 50 44 38
Jan-05 70 63 56 49 43 37 31
Jun-05 75 68 61 54 48 42 36
Jan-06 73 66 59 52 45 39 33
Jun-06 75 71 66 58 50 43 36
Jan-07 75 71 66 58 50 42 34
Jun-07 75 69 63 55 48 41 34
Jan-08 75 69 62 54 46 39 32
Jun-08 75 70 65 58 51 44 37
Jan-09 75 70 65 57 49 41 33
Jun-09 75 69 62 54 46 38 30
Jan-10 75 70 65 57 50 43 36
Jun-10 75 68 62 54 46 38 31
Jan-11 75 72 69 62 55 48 42
Jun-11 75 67 59 50 41 33 25
Jan-12 75 70 66 60 54 48 43
I'm guessing:
Jan-12 73 68 63 55 45 38 29
12. (Original post by master_blaster66)

Session 100 90 80 70 60 50 40
Grade A* A B C D E
Jun-01 75 68 60 52 45 38 31
Jan-02 69 63 57 51 45 40 35
Jun-02 72 65 58 51 44 37 30
Jan-03 70 64 58 52 47 42 37
Jun-03 71 64 57 50 44 38 32
Jan-04 73 67 61 55 49 43 38
Jun-04 75 70 64 57 50 44 38
Jan-05 70 63 56 49 43 37 31
Jun-05 75 68 61 54 48 42 36
Jan-06 73 66 59 52 45 39 33
Jun-06 75 71 66 58 50 43 36
Jan-07 75 71 66 58 50 42 34
Jun-07 75 69 63 55 48 41 34
Jan-08 75 69 62 54 46 39 32
Jun-08 75 70 65 58 51 44 37
Jan-09 75 70 65 57 49 41 33
Jun-09 75 69 62 54 46 38 30
Jan-10 75 70 65 57 50 43 36
Jun-10 75 68 62 54 46 38 31
Jan-11 75 72 69 62 55 48 42
Jun-11 75 67 59 50 41 33 25
Jan-12 75 70 66 60 54 48 43
doesn't give me hope since the majority are about 63-65 for an A
I happen to be an expert string cutter and I am disgraced by your lack of knowledge on the subject. I'll have you know i once cut a 20cm length of string into 0.0000001cm parts!

Yeah, I LOL'd inside when I saw the q in our paper was on sweet length.... wtf?
You must be the master of "pin the tail on the donkey".

Note to self, start measuring lengths of strawberry laces bought and use a hypothesis test to test whether a particularly short one is significant. If so, complain
14. Doesnt anyone have the paper even without solutions cos this guy is clearly not gonna upload it anytime soon
15. (Original post by aaronbenham)
You must be the master of "pin the tail on the donkey".

Note to self, start measuring lengths of strawberry laces bought and use a hypothesis test to test whether a particularly short one is significant. If so, complain
I like the way you think!
16. (Original post by arz15)
Argh I did this too
Arghh! I was pretty sure that it was poisson. But you never know. It could be
17. I would guess that an A would be 61 or 62 for this paper
18. Just out of interest, does the same examiner mark all the modules we have done in one exam season?
19. Hye I did binomial crossed it all out then did poisson realising as soon as i gave the paper that it was probably binomial..
My question is is I used Poisson and using my model did the right technique for the first 2 parts right and did a bit of workign out for the last question so will I get atleast a few method marks?

Also talking of the question on que times where it said the probability that random customer has to wait at least
half a minute more than the mean( which was 2)
Would it not be P(X<= 1.5) + P(X>=2.5) ?
20. (Original post by usamakhanlodhi)
Hye I did binomial crossed it all out then did poisson realising as soon as i gave the paper that it was probably binomial..
My question is is I used Poisson and using my model did the right technique for the first 2 parts right and did a bit of workign out for the last question so will I get atleast a few method marks?

Also talking of the question on que times where it said the probability that random customer has to wait at least
half a minute more than the mean( which was 2)
Would it not be P(X<= 1.5) + P(X>=2.5) ?
To your first bit, who knows. Maybe you'll get a few.

To your second bit, yeah that makes sense altho it was symmetrical so you could just have done 2(P(X<1.5)) i think... but it doesn't matter :P

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