OCR (not MEI) C2 - Wednesday 20th May 2015

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for question was the answers

360-a and 180-a or did it have to be in radians

you probably would have been able to write in degrees or radians as it didnt specify, but the answer wasn't that as the 2cosx graph had been stretched by a factor of 3 so it would have been 1080-a and 540-a, i did the same as you :frown:

Reply 241

xsanda

Original post by Jabba the cuunt

get an unofficial mark scheme up

Already done:

Original post by xsanda

Xsanda's solutions:R=-2;ar¹⁰ = 3072;Sum to 20 = -1048575;trapezium: 21.4;narrower strips;triangle area: 32.1;perimeter: 22.7;expansion: 64+192ax+240a²x²+…;a=2/3;y=4x^(3/2)-7x-3;(x-2)(x+5)(x-3);256;negative section of integration counts negatively;u₂₀ = 62;Σ = 517 (show that);N=24;n=17.1;x=32, y=8;6π-α;3π-α;graph of sin, half height;3.32, 12.7

Sorry if the line breaks are missing

(edited 8 years ago)

Reply 242

ZAK5YAK

Original post by Nuvertion

What do you think will be the grade boundary for an A? I reckon it'll be about 58 marks.

I think it will be lower than that, apparently its harder than last year ive been told so about 56 again? 55 maybe?

Reply 243

Nuvertion

Original post by ella_chloe

I reckon same as last year whatever thatw as

56, but I think it was slightly easier than last year. Also last year was the first time there were no AS January exams (I think) so it could've been lower than normal.

Reply 244

AlfieH

Anyone remember how the marks were split up for Q9?

Reply 245

username1006802

Original post by AlfieH

Anyone remember how the marks were split up for Q9?

9i - 1 mark
ii - 2 marks
iii - 2 marks
iii - 4 marks

Reply 246

Alex99999999

Do you guys not get to keep your paper? I kept mine. Also, for q9 the first two parts, it says to start that x is in radians, does that necessarily mean you need the answer in radians? I put both of mine in degrees, 1080-a and something.

Reply 247

xsanda

Original post by Alex99999999

Can you post a scan/photo of the question booklet, eg to IMGUR?

(edited 8 years ago)

Reply 248

kmzm10

what was the integration one i got 307and1/3 or something like that

Reply 249

wat a wizard

Was having problems with that aswell so went the old fashioned way ; 32+35+38...+62=517

Original post by DominoMatrix227

How did everyone prove that the answer was 517 for one of the summations question?

Reply 250

sandpitturtle

Original post by Nuvertion

56, but I think it was slightly easier than last year. Also last year was the first time there were no AS January exams (I think) so it could've been lower than normal.

I think this year was harder :/ i got 90% as a mock of last year and this year probably lost about 12 marks :/

Reply 251

Rubberduckiller

so did u n=-44 idk now... someone please how many marks gone???

Reply 252

wat a wizard

Original post by xsanda

Already done:
Sorry if the line breaks are missing

Original post by xsanda

Already done:
Sorry if the line breaks are missing

I think the sum to 20 might be wrong

Reply 253

chris2015

A=53, B= 46. This was the trickiest paper I have ever came across.harder than any previous years.

Reply 254

Alex99999999

Original post by wat a wizard

Was having problems with that aswell so went the old fashioned way ; 32+35+38...+62=517

You just use the formula. but remember there are 11 numbers as you include the first.

So work out the 10th term, U10=5+(9x3)

Then sub that answer into the sum formula

S10 = 1/2 x 11 ( 2(32) + 10 (3) )

Hope this helps

Reply 255

DominoMatrix227

How many marks dropped for getting N=-44 or 125/3?

Reply 256

DominoMatrix227

Was there anyone who did not complete all the questions?

Reply 257

MartoEnchev

Original post by Rubberduckiller

so did u n=-44 idk now... someone please how many marks gone???

I got a quadratic and the 2 solutions were n=-44 and n=(a positive number not sure the exact value). n can't be negative though. However I don't think that was the right way to solve it