Stats 2 (S2) OCR (not MEI) 22nd June 2012

wibletg

3

Hi all,

There's not a thread for this, thought I'd create one :smile:

How's the revision going? Any sticking points?

Reply 1

wibletg

OP

3

Anyone got the Jan 12 PP and MS?

Cheers

Reply 2

Matthew692692

Original post by wibletg

Anyone got the Jan 12 PP and MS?

Cheers

Ask Syntax error, they have loads!

I'm stuck on a question! Can anyone help me? It Q6)i) June 2007! It doesn't make sense to me!

This was posted from The Student Room's iPhone/iPad App

Reply 3

Matthew692692

Original post by Matthew692692

Ask Syntax error, they have loads!

I'm stuck on a question! Can anyone help me? It Q6)i) June 2007! It doesn't make sense to me!

This was posted from The Student Room's iPhone/iPad App

Oh never mind, it was cumulative and I was trying to do point. Flail.

This was posted from The Student Room's iPhone/iPad App

Reply 4

NightBear

12

Didn't think I'd be resitting this, but here I am :colonhash:

Bohoo, S2.

OP

Hopefully this goes better than FP2 did...

Reply 7

etothepii

6

can't imagine any exam going worse than that FP2 paper, tbh

Reply 8

wibletg

OP

3

Original post by etothepii

can't imagine any exam going worse than that FP2 paper, tbh

There seems to be a common pattern emerging among people who sat that exam... they all hated it :tongue:

Reply 9

etothepii

6

Original post by wibletg

There seems to be a common pattern emerging among people who sat that exam... they all hated it :tongue:

If the A* pupils hated it, I cannot imagine what sort of student liked that exam :tongue:

Unfortunately, I'm the only one doing FM from my school so I was under the impression that I'd done extremely badly until I saw the rage on TSR :tongue:

Reply 10

wibletg

OP

3

Original post by etothepii

If the A* pupils hated it, I cannot imagine what sort of student liked that exam :tongue:

Unfortunately, I'm the only one doing FM from my school so I was under the impression that I'd done extremely badly until I saw the rage on TSR :tongue:

The only one :redface:

To be fair, our year is unusual in that 10 people are taking it to A2 - last year there were only 2 :tongue:

Yeah, there was quite a bit of nerd rage. It should be interesting to see the boundaries in August :tongue:

Reply 11

etothepii

6

Original post by wibletg

The only one :redface:

To be fair, our year is unusual in that 10 people are taking it to A2 - last year there were only 2 :tongue:

Yeah, there was quite a bit of nerd rage. It should be interesting to see the boundaries in August :tongue:

I don't think we've ever had more than 5-6 people take it, even at AS.

Doing Maths at uni, I'm guessing?

Reply 12

wibletg

OP

3

Original post by etothepii

I don't think we've ever had more than 5-6 people take it, even at AS.

Doing Maths at uni, I'm guessing?

No, only one person is doing maths at Uni :tongue:

Our school focuses more on Mechanics modules because the FM teacher did Physics as a degree, so we've got 5 engineers, 1 computer scientist, someone doing economics, a physicist and the only person doing maths :redface:

Reply 13

etothepii

6

Original post by wibletg

No, only one person is doing maths at Uni :tongue:

Our school focuses more on Mechanics modules because the FM teacher did Physics as a degree, so we've got 5 engineers, 1 computer scientist, someone doing economics, a physicist and the only person doing maths :redface:

Oh, I see. I'd have loved to do more mechanics modules but one of our two FM teachers did Stats so I ended up doing S1-S3, lol. tbh, S1 was the only tedious one; I found S2 and S3 slightly more interesting, especially the latter.

Reply 14

Killjoy-

8

2012 S2 paper and MS anyone? :colondollar:

Reply 15

Matthew692692

Original post by Killjoy-

2012 S2 paper and MS anyone? :colondollar:

Mark scheme: http://www.thestudentroom.co.uk/attachment.php?attachmentid=149664&d=1337531542
Question paper: http://www.thestudentroom.co.uk/attachment.php?attachmentid=149663&d=1337531542

This was posted from The Student Room's iPhone/iPad App

Reply 16

wibletg

OP

3

here

Statistics 2 Mark Scheme January 2012.pdf196.9KB

Statistics 2 January 2012.pdf228.9KB

Reply 17

ellie_159

Can anyone help me on Question 9(iv) in January 2010?
(a) Without using an approximation, find an expression for the probability that in m square metres there are at least 2 buttercups?

Thanks in advance!

Reply 18

Killjoy-

8

Original post by ellie_159

Can anyone help me on Question 9(iv) in January 2010?
(a) Without using an approximation, find an expression for the probability that in m square metres there are at least 2 buttercups?

Thanks in advance!

3 buttercups per cubic metre, so for m cubic metres the distribution of X, no. of buttercups, is x~Po(3m).
At least 2, so P(X>=2)= 1-P(X=<1)

Then use the poisson formula with 3m in place of lambda and you should arrive at the expression they want.

Reply 19

Matthew692692

Original post by ellie_159

Can anyone help me on Question 9(iv) in January 2010?
(a) Without using an approximation, find an expression for the probability that in m square metres there are at least 2 buttercups?

Thanks in advance!

The probability will change to 3m
So then your left with X~Po(3m)
P(X

\geq

2)
and use the formula
1-( (e^-3m x

\frac{3m^1}{1!}

) + (e^-3m x

\frac{3m^0}{0!}

))
which equals
1- e^-3m(3m+1)

Stats 2 (S2) OCR (not MEI) 22nd June 2012

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