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# Mr M's OCR (not OCR MEI) Core 1 Answers May 2013 Watch

1. PLEASE CAN SOMEONE TELL ME WHAT QUESTION 9 PART iii WAS. THIS IS KILLING ME!!!! I AM NOT SURE IF I ANSWERED IT
2. Does anyone reckon 65-66 Marks may get 90 UMS ?
3. (Original post by christineyunka)
if I got 92 raw mark, what would that roughly be in terms of UMS?
It is out of 72 Raw Marks.
4. (Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 1 Answers May 2013

1. (i) (2 marks)

(ii) (1 mark)

(iii) (1 mark)

2. or (5 marks)

3. (i) (3 marks)

(ii) (2 marks)

4. (i) (3 marks)

(ii) (3 marks)

(iii) (2 marks)

5. (i) Correct sketch (2 marks)

(ii) (2 marks)

(iii) Stretch scale factor parallel to y axis (2 marks)

6. (i) Centre and radius (3 marks)

(ii) (2 marks)

7. (i) (2 marks)

(ii) (5 marks)

8. (7 marks)

9. (i) Correct sketch with intersections at (-1.5, 0) and (2, 0) and (0, -6) (5 marks)

(ii) OR (either will be marked correct) (3 marks)

(iii) (4 marks)

10. (i) (7 marks)

(ii) Minimum (2 marks)

(iii) (5 marks)

I'll be around to answer questions shortly.

Hey guys! For question 8 I didn't times through by 2 at the end and so ended up with 3x+y -1/2= 0 rather than 6x+2y-1=0 Any idea if this would affect the mark I get and if so, by how many? THANK YOU
5. (Original post by C94)
Does anyone reckon 65-66 Marks may get 90 UMS ?
63 is probs an A so im guessing not... i am annoyed just as much as you are
6. (Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 1 Answers May 2013

5. (i) Correct sketch (2 marks)

(ii) (2 marks)

(iii) Stretch scale factor parallel to y axis

I'll be around to answer questions shortly.
Hi Mr M thanks for these! Think I got everything right- but have probably negated a mark for myself in 5 (iii)

I explicitly stated a stretch by scale factor half parallel to the y axis
Then at the end of the question box, leaving quite a lot of space I put in scruffy writing, in brackets, with a ... after it (surely can be both x and y axis) ...

I will most likely get penalised for this won't I?
I wrote it there before checking my paper, to remind myself to come back and forgot to cross it out!!
7. Hi Mr. M,
for q10 I had the right method but I got the wrong value for k. I got k=-7 Part two I differentiated my equation correctly and got that it was min, but for part 3 when I equated my dy/dx equation to 9 it was unsolvable. How many marks do you think I will lose?
8. 100% mothers
9. For question 2 if i did the correct working but got the signs the wrong way, will i still get 2 or 3 marks out of 5 for working? I.e. i put -1/2 and 1
10. (Original post by bmton500)
Mr M, what was question 8?
Thanks
A is (-2, 6) and B is (3, -8). The line l is perpendicular to x - 3y + 15 = 0 and passes through the midpoint of AB. Find the equation of l in the form ax + by + c = 0 where a, b and c are integers.
11. (Original post by cheetahs56)
Mr M, for the last question for the stationary points i differentiated, equaled it to 0 as the gradient=0, but somehow got k= -4 instead of -5. How many marks would I lose for the answer?

Also for the final part to the last question, i stupidly did -18-9=-9. This means I got the co-ordinates as (-2,-9). However I factorised correctly and got the correct co-ordinate for x, how many marks would I lose for that? Thanks!
drop 1 and drop 1
12. (Original post by IchigoKurosaki)
For Q7 part 2 I missed the 0 boundary, would I only lose 1 mark for this?
No lose 2.
13. (Original post by C94)
Hello Mr M,

1.For Question 5(iii), I put, A stretch parallel to the Y-axis by a scale factor of 2. I thought it was going from 1/x^2 to 2/x^2, thats why I did that. Will I get any marks?

Also, for Question 6, I completed the square, but got (x-0)+(y-4)=40 , and for my Centre I put (0,4) and Radius Sqrt(40).
Because this part of the question was wrong, the Point B on 6(ii) was different too, but the write answer using (0,4)

Thanks,
C94
5iii) drop 1

6) drop 2 - you might get full credit on the second bit
14. For the first time in two years I finally did well in a maths exam; does anyone have any idea of what 67 raw marks usually converts to in UMS for Core 1?
15. (Original post by ashraf549)
Suppose I put two answers down with all workings, one is incorrect and one is right. How marks will i lose? ...This is for the last question
16. (Original post by sugartown)
I put +/- 1/2 as a route instead of just as 1/2 will I still get the mark?
also think did the correct method but the wrong answer for part (iii) on the last question will I still get method marks? And if so how many?
drop 1 mark

and yes you will get method marks if you did the correct method
17. (Original post by Aerosports)
Hey Mr M i compeleted the square for 7(ii) and wrote x= 5/2 +/- root 50/8 would i lose all marks
x shouldn't equal anything as this is an inequality.

You may not get any marks for that.
18. (Original post by John12141)
Hi I put down (0,-9) and (-2,-27) for the last question but stated A as being (0,-9) cos I thought that fit the equation given. Any ideas how many marks I'll lose?
1 or 2.
19. (Original post by franselmetti)
I just used the values I got from completing the square...
That's what you were expected to do.
20. (Original post by The Bigman)
Mr M what if I wrote question 3 out like 36X^-4??
That's fine.

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