Mr M's OCR (not OCR MEI) Core 2 Answers May 2012 <strong><font

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Reply 260

19hannah94

Does anyone have a link/know where I can find all the questions?

Reply 261

kenann

Original post by 19hannah94

Does anyone have a link/know where I can find all the questions?

http://www.thestudentroom.co.uk/showthread.php?t=2003552&page=18&p=37613213#post37613213

Reply 262

Scott Lucas

Original post by IShouldBeRevising_

Hey do you remember what the last question was by any chance, I mean the last part of the last question one that was worth 5 marks.

here's the last question if you still need help

last question c2 2012.jpg

Reply 263

Scott Lucas

Original post by Mr M

All fine except for your 0<y<1

The explanation is a couple of pages back in this thread

thanks a lot, ill check now and thank you for the mark scheme

Reply 264

jessy_78

cant believe it :frown:

for question 3 i made the area of the sector equal to 45 instead of 45pi. Does this mean ill loose all the marks for ii and iii? OR could you tell me how many if any method marks i will get?

Reply 265

levantine

if for the boundaries are for example 58/72 for an A which trasnlates into 80/100 and 51/72 is a B then will 90/100 be 65/72 or does it not work out like that

Reply 266

Mr M

Study Forum Helper

Original post by jessy_78

cant believe it :frown:

for question 3 i made the area of the sector equal to 45 instead of 45pi. Does this mean ill loose all the marks for ii and iii? OR could you tell me how many if any method marks i will get?

You will possibly only lose 1 accuracy mark.

Reply 267

Mr M

Study Forum Helper

Original post by levantine

if for the boundaries are for example 58/72 for an A which trasnlates into 80/100 and 51/72 is a B then will 90/100 be 65/72 or does it not work out like that

Yes it works out like that but you still have to guess the position of A and B!

Reply 268

safiyasaeed

how much for a b ish?

Reply 269

safiyasaeed

Isn't 51/72 the ''normal'' boundaries for a B. And considering this paper was trickier than others, it would go down right?

Reply 270

jessy_78

Original post by Mr M

You will possibly only lose 1 accuracy mark.

is that across both of the questions?

Reply 271

Mr M

Study Forum Helper

Original post by jessy_78

is that across both of the questions?

Yes I expect so. A misread is only penalised once.

Reply 272

fallen_child

Original post by Mr M

Mr M's OCR (not OCR MEI) Core 2 Answers May 2012

5. (a) (i)

u_2 =\frac{1}{2}

and

u_3 = 4

(2 marks)

(ii) Cycles periodically between 4 and 1/2 (1 mark)

(b) a = -2 and d = 2.5 (5 marks)

Mr M, for 5 b) i have misread the read question and set it equal to 16 instead of 18 but i did all of the working so how many mark will i lost??

Reply 273

Kavzaz

Original post by Mr M

Yes I expect so. A misread is only penalised once.

Can you try and break down the marks for the last part of question 9? Anything you can do would be extremely helpful. Thanks in advance.

Reply 274

Lollipop12

For question 4 - I used cos identity and changed 7sinx to cos. Got 90 degrees but obviously other answers were different. will i get any marks?

Reply 275

Mr M

Study Forum Helper

Original post by fallen_child

Mr M, for 5 b) i have misread the read question and set it equal to 16 instead of 18 but i did all of the working so how many mark will i lost??

Probably 2 - I'm not sure they will recognise that as a misread - they will probably think you did it deliberately for some reason.

Reply 276

Mr M

Study Forum Helper

Original post by Lollipop12

For question 4 - I used cos identity and changed 7sinx to cos. Got 90 degrees but obviously other answers were different. will i get any marks?

I'm not sure what you have done. That sounds pretty wrong.

Reply 277

Mr M

Study Forum Helper

Original post by Kavzaz

Can you try and break down the marks for the last part of question 9? Anything you can do would be extremely helpful. Thanks in advance.

Substitute into sum to infinity formula (1)

Multiply both sides of equation by 1-log_2 y (1)

Apply two log laws (2)

Obtain answer (1)

Reply 278

Kabelan1

Hi Mr M, i made a silly error on the trapezium rule,
by having one of my ordinates wrong, but i did everything correct and showed full working out, but got 64, because of the wrong ordinate, will i get any marks out of 3?