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# OCR MEI AS Mathematics Core 1 13/05/2013 watch

1. (Original post by TheNote)
the average of paapers is meant to be around 58, but i think paper had a few questions that either confused some people or they didn't quite get the correct answer, so I think A will be around 55 maybe 54 if we are lucky
I'm guessing the same 54 would be lovely though
2. (Original post by TheNote)
90% sure question 2 was perpendicular.
It was 100% PERPENDICULAR.
I repeat, the question asked you to find a PERPENDICULAR line, not parallel.
3. (Original post by TheNote)
90% sure question 2 was perpendicular.
i am 100% sure it was perpendicular
4. (Original post by user1-4)
does anybody the last question? We can go through it and figure out the 'actual answer.'
See if it is 4/0 or the other one
It is definitely 4 and 0, none of the others work
5. (Original post by LRJ)
The differentiating method works, but so does the discriminant method

1/(x-2) = y
y= -x + k

1/(x - 2) = -x + k
1=(x - 2)(-x + k)
1= -x^2 + kx +2x -2k
0= -x^2 +(2+k)x -2k -1

so b^2 -4ac =0 (as for tangents, there is only one intersection)

(2+k)^2 -4(-1)(-2k-1) =0
(2+k)(2-k) +4(-2k-1) =0 EDIT: (2+k)(2+k) +4(-2k-1) =0
k^2 +4k +4 -8k -4 =0
K^2 -4k = 0
k(k-4) = 0

therefore k=0 and k=4

I remember the last question of Jan11 had a similar sort of question, I worked it out using differentiation, but only the discriminant method was in the mark scheme, even though I thought both methods worked fine, that question was slightly different though, so hopefully both methods will be awarded this time might be a good idea to check that mark scheme actually!
I used differentiation and came to the right answer and I spoke to my teacher and he said as it didn't say to use a specific method, they can't penalise it. It may not be written in the mark scheme as they don't expect core 1 candidates to know/use it, but it'll be in the examiner's guideline thingy and they can't reject it as a method
6. I don't know if anyone posted the paper, I presume no one has. But , I know its a few days late but I got a copy:

7. Is there going to be an unofficial mark scheme?
8. ****KK lost 3 marks on that first question, I've dropped at least 8 marks now fml might not even get an A

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9. How much raw marks do u lot reckon wil be enough for 100 ums?

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10. (Original post by ArsenalWenger)
How much raw marks do u lot reckon wil be enough for 100 ums?

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Seems to be between 70 and 72 for the other years, I think 72 will be full UMS, but then again I thought 59/60 would be for an A which is higher than what other people think on here, so I could be very wrong
11. What would 67/72 be in ums?
12. Unofficial ms: predicting 62/72 for an A
OCR MEI C1 MAY 2013 UO MARK SCHEME.docx
13. i hope its 70 for full ums

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14. does anyone have a copy of this past paper for this exam if so can you please send the link
15. Im really excited to know what I got in this exam, considering how terribly awful M1 went!
16. and C2
17. This is stressing me out, I worked incredibly hard and c2 was an absolute shambles so boundaries better be quite low, and for this I think I'm getting low 60's which has annoyed me cus I dropped so many silly marks and due to my s1 being only 83ums I need this to be into the A to cover up lost marks in c2, I'm hoping no more than 60 on this for an A
18. (Original post by Josh96)
This is stressing me out, I worked incredibly hard and c2 was an absolute shambles so boundaries better be quite low, and for this I think I'm getting low 60's which has annoyed me cus I dropped so many silly marks and due to my s1 being only 83ums I need this to be into the A to cover up lost marks in c2, I'm hoping no more than 60 on this for an A
C2 was horrible indeed
I think the grade boundaries for C1 will be 59 for an A. It was 58 for an A in January which I thought was absolutely ridiculous as the paper was horrific!
19. (Original post by Matt_dragon)
C2 was horrible indeed
I think the grade boundaries for C1 will be 59 for an A. It was 58 for an A in January which I thought was absolutely ridiculous as the paper was horrific!
Could not agree more! plus with the option to resit being 9 months after seeing our AS grades, i really hope they cut us some slack
20. 62/72 for an A!!!

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