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

1. (Original post by Emsss)
Hi Mr M
On 3i) I wrote it in this order: 6000x^2 + 960x + 64 instead of '64 + 960x + 6000x^2
Wil I lose any marks?

And on 4b i) when integrating I wrote -12x^-2 + k. And then put the x^2 on the bottom to make -12/x^2. + k. Will I still get all the marks for this?

So worried
3i) It asks for the first three terms in ascending powers of x. You seem to have the last three terms in descending powers of x. As they are the same I expect you will get full marks.

4bi) that's fine
2. (Original post by stevea)
Hi Mr M,
For 8cii, I managed to show that, but i did it a long winded way taking logs of 10 and then changing the base to 2 near the end, it was all clear working and managed to get the correct solution though, how many marks would i lose?
If it was right then you get full marks.
3. (Original post by Mr M)
2) yes in some cases e.g. question 1 you will lose marks

The question paper says "Give non-exact numerical answers correct to 3 significant figures unless a different degree of accuracy is specified in the question or is clearly appropriate". They don't mind if you are more accurate than this.

9 part 2) drop 1

area) you *might* get a mark
Thanks a lot, so just to clarify, I got full marks on question 2? AND finally for the 5 mark log question i made the two exponentials equal to each other and logged them, would I gain a mark?
Sorry to be a pain,
Many thanks
4. (Original post by TSR29)
Thanks a lot, so just to clarify, I got full marks on question 2? AND finally for the 5 mark log question i made the two exponentials equal to each other and logged them, would I gain a mark?
Sorry to be a pain,
Many thanks
I don't know why I numbered that 2 but 1 d.p. would have been fine on question 2. Use 3 s.f. in the future.

and finally - yes 1 mark
5. (Original post by Mr M)
I don't know why I numbered that 2 but 1 d.p. would have been fine on question 2. Use 3 s.f. in the future.

and finally - yes 1 mark
OK thanks a lot for your help
6. So part 4)b)part 1) I got -6x^-4 + c and then used this answer for part 2. Assuming my working out for the second part was correct how many marks would I lose?

For 7 part 2 I found the tangent intergrated the two curves, put the values in and got 1.9. How many marks would I lose?
7. (Original post by dangermouse123)
So part 4)b)part 1) I got -6x^-4 + c and then used this answer for part 2. Assuming my working out for the second part was correct how many marks would I lose?

For 7 part 2 I found the tangent intergrated the two curves, put the values in and got 1.9. How many marks would I lose?
Gain no parts on 7ii) and 2 marks on 7iii) I expect

7ii) I don't think that is worth anything - 1 mark at most.
8. Thanks mr m
9. Grade boundaries? Any guesses?
10. For the 6 marker log question I did show my working until I got N was 17 but I was over thinking and carried on from this and wrote some rubbish underneath it involving the number 1800 and a wrote N was 2.6 or something as well. So I wrote the correct solution and the wrong one. I'm guessing marks would be deducted. How many marks you think I got /6 with the information provided above?

Posted from TSR Mobile
11. I did that as well becuasei thought you had to use the 1800 so i used sum to inifnity
12. For 6(i) I made a very stupid mistake and put the amount at the 30th instance that would be used, rather than the sum of 30 instances.

I put down a and d, however. Would that net me a mark?
13. (Original post by The_Blade)
For the 6 marker log question I did show my working until I got N was 17 but I was over thinking and carried on from this and wrote some rubbish underneath it involving the number 1800 and a wrote N was 2.6 or something as well. So I wrote the correct solution and the wrong one. I'm guessing marks would be deducted. How many marks you think I got /6 with the information provided above?

Posted from TSR Mobile
You might only lose 1 mark if you are lucky.
14. (Original post by Expert #7451)
For 6(i) I made a very stupid mistake and put the amount at the 30th instance that would be used, rather than the sum of 30 instances.

I put down a and d, however. Would that net me a mark?
yes 1 mark
15. Hi, how many marks would i lose if i didnt put +k when intergrating?
And also how many would i drop if i left my answer as 17.2 instead of 17?
Thanks
16. (Original post by aran0909)
Hi, how many marks would i lose if i didnt put +k when intergrating?
And also how many would i drop if i left my answer as 17.2 instead of 17?
Thanks
drop 1 and drop 1
17. (Original post by Mr M)
drop 1 and drop 1
would i drop one on each question where i didnt put +k?
also for 4ii) how many marks would i drop if i put -2?
Thanks
18. For the last question, i wrote an extra solution of 2pi, would i lose a mark? How many marks would i lose for doing the correct working but using the wrong value of x in question 7? (the area between curve and tangent)

Posted from TSR Mobile
19. (Original post by aran0909)
would i drop one on each question where i didnt put +k?
also for 4ii) how many marks would i drop if i put -2?
Thanks
Probably just lose 1 mark in total for missing + k

Drop 1 mark for -2
20. (Original post by roar96)
For the last question, i wrote an extra solution of 2pi, would i lose a mark? How many marks would i lose for doing the correct working but using the wrong value of x in question 7? (the area between curve and tangent)

Posted from TSR Mobile
drop 1 for the extra solution

what do you mean by "using the wrong value of x"?

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