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

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So, harder or easier than June 2011?

Can expect the grade boundaries to be about the same.

Just one question, will you lose marks if you didn't change take the 1/60 out of the CDF, i.e. 1/60(20x - X^2 - 40), and kept it inside? Basically, will you lose marks for having it down as:

-1/60x^2 + 1/3x - 2/3

Reply 321

jukebox123

This paper was much easier than the June 2011 one. It was far too easy. Boundaries will be sky high!

A* - 72/75
A - 69/75
B - 66/75
C - 63/75
D - 60/75
E - 57/75

Reply 322

bexlovescandy

Original post by jukebox123

This paper was much easier than the June 2011 one. It was far too easy. Boundaries will be sky high!

A* - 72/75
A - 69/75
B - 66/75
C - 63/75
D - 60/75
E - 57/75

Loooks like I'm failing then :L

Reply 323

fruktas

Original post by Groat

What value are you using? Works perfectly fine with n=35 to me. n=34 gives an answer below 0.9. I used the sum function on my calculator to check in the exam.

n=35 gives P(X<35) as above 0.9 ?

Reply 324

fruktas

Original post by bexlovescandy

Loooks like I'm failing then :L

Do not listen to what the kids are saying! No one knows what the boundaries will be

Reply 325

Gibbo81

Solutions now in the first post (asap meant when I wake up)

Reply 326

bexlovescandy

Original post by fruktas

Do not listen to what the kids are saying! No one knows what the boundaries will be

I know

I was joking, but thank you anyway, just hoping edexcel aren't harsh like January :smile:

Reply 327

fruktas

Original post by Groat

What value are you using? Works perfectly fine with n=35 to me. n=34 gives an answer below 0.9. I used the sum function on my calculator to check in the exam.

Pardon me, I remembered the inequality of the question the wrong way around!

Reply 328

fruktas

Original post by Gibbo81

Solutions now in the first post (asap meant when I wake up)

Thank you so much for the solutions!

But in question 2, part a) 1 - 0.9784 = 0.0216 not 0.0215?

Reply 329

Kenan and Kel

Grade Boundary predictions (usually pretty good at this):

100 90 80 70 60 50 40
_75 68 61 54 47 41 35

Reply 330

amoo94

Original post by Gibbo81

Solutions now in the first post (asap meant when I wake up)

i think i only got about 60-65 :/ i saved my answers in my calculator so i could check and it seems i rounded stuff wrong in places (doh!) but i always wrote the fractional answer as well so maybe, just maybe, they'll give me the benefit of the doubt!

Reply 331

racing_stripes

Can someone upload the marksheme please?

Reply 332

amoo94

Original post by racing_stripes

Can someone upload the marksheme please?

they have. it's in the first post

Reply 333

agent87

Original post by Kenan and Kel

Grade Boundary predictions (usually pretty good at this):

100 90 80 70 60 50 40
_75 68 61 54 47 41 35

You think this is on the same level as june 2010. in june 2010 there was this 5 marker people didn't do so well on. what was there in ours. last question. or maybe the one with the mean of +- o.5 from the mean.

Reply 334

bexlovescandy

Original post by amoo94

Think I did the same really. I hope I counted right this time!

Reply 335

jukebox123

looks like i got 75/75 :colone:

... M3 is next :biggrin:

Reply 336

fruktas

72-73 since I used the wrong binomial table for the last question! Peak!

Reply 337

Gibbo81

Original post by fruktas

Thank you so much for the solutions!

But in question 2, part a) 1 - 0.9784 = 0.0216 not 0.0215?

Well spotted.

I think I was working them out in my head. Doh!

Reply 338

popat06

Gibbo, how many marks would I lose for integrating q5d between 1.5 and 2.5
Also, would I lose 1 mark for leaving my answer as 15 for the final question?

Reply 339

ExplosiveSam

How many marks would I lose for listing all of the different outcomes on question 6 but getting the probabilities wrong?

how many marks would I get on 8B for getting the method right but reading the wrong table (I read 0.0133 as 0.133)?