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# Mr M's OCR (not OCR MEI) Core 2 Answers May 2013 watch

1. (Original post by 4Hyunah)
DbHi Mr M

For question 5i) i got the area of BDC to be 61.9. How many marks would i
lose? I got area of sector to be 102 and area of triangle to be 40.1.

For 6i) if i used logs to show that n= 17 then did 1.3^17 which is 86.5 to show that it is smaller than 91. How many marks would i get as i didn't use the value 1800g in my working.

Also for 8ia) i put y= 1 but next to it i also put (0,1). Would i get the mark??

Thank you!!!!!!!
8ia) fine
2. 1) For 6ii), I ended up with N <= 17 (not N=17). This doesn't lose any marks does it? After all the inequality was 1.3^N <= (something, forgotten what), not 1.3^N = (that something).

2) For 5ii), I wasn't sure if perimeter included the line BD as that wasn't on the surface of the shape, so I just wrote down both possible answers specifying that perimeter = 34.0 but if the question means only to count the lines on the surface then perimeter = (34.0 - BD, forgotten the value of BD now). Would I lose any marks?
3. (Original post by roselle.orleans)
Oh, wow. Thats better than I expected. Thank you so much for the help. I've been beating myself up for the stupid mistakes I've done. Now, I kinda feel better. Thanks for the mark scheme! You're the best!
Ok you're welcome.
1) For 6ii), I ended up with N <= 17 (not N=17). This doesn't lose any marks does it? After all the inequality was 1.3^N <= (something, forgotten what), not 1.3^N = (that something).

2) For 5ii), I wasn't sure if perimeter included the line BD as that wasn't on the surface of the shape, so I just wrote down both possible answers specifying that perimeter = 34.0 but if the question means only to count the lines on the surface then perimeter = (34.0 - BD, forgotten the value of BD now). Would I lose any marks?
6ii) drop 1 - the question says N is the greatest integer value that satisfies the inequality

5ii) It's not multiple guess - you will lose 1 mark - only one region BDC is marked on the diagram
5. For question 8 ii, it took me ages to figure out, and I did lots of working resulting in a very messy answer booklet. I used the extra paper booklet and there were loads of crossing. (Literally used two sides of working with crossing out etc until I got the final answer) I did eventually get the correct answer, but is there a risk of losing marks for bad layout?
6. (Original post by Mr M)
5ii) It's not multiple guess - you will lose 1 mark - only one region BDC is marked on the diagram
Even though I explicitly stated the perimeter = 34.0, and then wrote in brackets that, if they were asking for something different, it would be =(this different answer) instead?
Even though I explicitly stated the perimeter = 34.0, and then wrote in brackets that, if they were asking for something different, it would be =(this different answer) instead?
Sorry - it's wrong. You demonstrated that you didn't understand the question which was unambiguous.
8. Mr M

Hi (again)

For 6)i) i misread the summation formula for an arithmetic question and wrote down a instead of 2a and so got the wrong answer although all other values were subbed in correctly, how many would i drop?

For the very last question i got 2/3pi ,pi, discluded cos^-1 3/2 but instead of doing 2 pi -2/3 pi i did pi + 2/3 pi getting 5/3 pi not 4/3 pi and i wanted to know if i'd drop 1 or 2?

thanks
9. (Original post by eggfriedrice)
For question 8 ii, it took me ages to figure out, and I did lots of working resulting in a very messy answer booklet. I used the extra paper booklet and there were loads of crossing. (Literally used two sides of working with crossing out etc until I got the final answer) I did eventually get the correct answer, but is there a risk of losing marks for bad layout?
No. The examiner will curse but you will get all the marks if the answer is there somewhere.
10. (Original post by Mr M)
No. The examiner will curse but you will get all the marks if the answer is there somewhere.

Haha, sorry Mr. Examiner! But that's a relief, thanks (:
11. (Original post by James_01)
Mr M

Hi (again)

For 6)i) i misread the summation formula for an arithmetic question and wrote down a instead of 2a and so got the wrong answer although all other values were subbed in correctly, how many would i drop?

For the very last question i got 2/3pi ,pi, discluded cos^-1 3/2 but instead of doing 2 pi -2/3 pi i did pi + 2/3 pi getting 5/3 pi not 4/3 pi and i wanted to know if i'd drop 1 or 2?

thanks
6i) drop at least 2 (misreading the formula book does not count as a misread)

last question drop 1
12. Would I receive marks if for the intercepts I just put 1 and 4 instead of (0,1) and (1,4)?
13. What was question 4ii)

Posted from TSR Mobile
14. Hi Mr M,

For the logs question 8ii, I wrote:
a^x=4b^x
b=2/a
xlog2a=xlog2(4(2/a))
xlog2a=xlog2(4)+xlog2(2)+xlog2a
2xlog2a+(1)x=(2)x
x(2log2a+1)=2x
Then I wrote the answer. Would I get any marks?
Thanks
15. (Original post by Matternot)
Would I receive marks if for the intercepts I just put 1 and 4 instead of (0,1) and (1,4)?
I don't think so.
16. On the sinx=3cosx I did
1=3cosx/sinx=3tanx
tanx=1/3 and solved tanx to 1/3

How many marks will I lose?
17. (Original post by Ellie_Rosa)
Hi Mr M,

For the logs question 8ii, I wrote:
a^x=4b^x
b=2/a
xlog2a=xlog2(4(2/a))
xlog2a=xlog2(4)+xlog2(2)+xlog2a
2xlog2a+(1)x=(2)x
x(2log2a+1)=2x
Then I wrote the answer. Would I get any marks?
Thanks
2 marks I think.
18. Mr M,

For the perimeter of the region question I got the side BD to be 7.51cm using BD^2 = 7^2 + 16^2 - 2(7x16) x cos(0.8) which gave me 56.433... which hence gave me 7.51, I got the arc length and the side of 9cm correct though. How many marks would I lose?
19. (Original post by Dugald)
On the sinx=3cosx I did
1=3cosx/sinx=3tanx
tanx=1/3 and solved tanx to 1/3

How many marks will I lose?
You'll get one mark if you are lucky.
20. (Original post by Mr M)
2 marks I think.
Thank you!

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