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# Gcse mathematics a calc paper 2 09/06/16 unofficial markscheme

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1. Here are the marks and answers (working out not included)! Try not to stress too much and focus on your next exam if you have any left.

1. Stem and Leaf Graph with a key and the probability being 0.45 or 9/20 (5 marks overall)

2.
a) Simplify 3a x 5b x 2c => 30abc (1 mark)
b)Factorise 3y+6 => 3 (y+2) (1 mark)
c) Expand x(x-3) => x^6 - 3x (1 mark)

3. 9.25 (perimeter of the rectangle) (3 marks)

4. 18 bags (4 marks)

5. 0.09 and 0.36 (probability of the counters) (3 mark)

6. (BMI & ski question)
a) 20.3 (2 marks)
b) 68.04 (2 mark)
c) 2.61 (3 marks)

7. 3.8 (trial and improvement) (4 marks)

8.
a) 4:3 (not sure if 1:0.75 would allowed?) (2 marks)
b) 480 px (2 marks)

9. 124 (work out x question) (4 marks)

10. 7.92 (estimate the mean from a table) (4 marks)

11. £42.28 (colin's car) (5 marks)

12. 144 (pentagon) (4 marks)

13.
a) -1, 1, -1 (2 marks )
b) diagram (cubic graph) (2 marks)

14. 3 bars (metal bars) (5 marks)

15. No, it has not lost more than half of it's value (paul's car) (4 marks)

16.
a.128g (median weight of apples) (1 mark)
b. 11g (IQR of apples) (2 marks)

17. 30.1 (pythagoras and sohcahtoa) (4 marks)

18. y = 5p^2 - x (make y the subject) (5 marks)

19. 10 or 11 (stratified sampling - both WILL be expected as it has been over the years) (2 marks)

20.0.29, -2.29 (rounding may be allowed so 0.30 and -2.30) (quadratic formula) (3 marks)

21. 29.25 (upper bounds) (3 marks)

22.28.9 (arc segments) (3 marks)

23. Frequency Density from top to bottom: 1.6, 3.2, 2.4, 1.8, 0.3 and you had to show this on a graph (Histograms) (3 marks)

24.
a. -1 over 3x -4 (algebraic fractions) (2 marks)
Write x over x-1 minus x over x + 1 as a single fraction in its simplest form (3 marks)

25. 80.4 (6 marks)

Best of luck to those of you remaining exams.
2. 2x/(x-1)(x+1)
3. agh no! dropped a few marks
4. (Original post by BDunlop)
2x/(x-1)(x+1)
is this for 24b?
5. Isn't 2c) x^2-3x not x^6-3x?
6. Looks like ive got around 92 marks, im pretty happy with that!
7. (Original post by BDunlop)
2x/(x-1)(x+1)
isn't it 2x/x^2-1
Looks like ive got around 92 marks, im pretty happy with that!
Ah nice one, hope you get the A*! I have got 93 or maybe above so yeah, A* for both of us fingers crossed!
9. (Original post by Fluffpuffle)
Isn't 2c) x^2-3x not x^6-3x?
Yes, you are correct
10. I got 20 bags of crisps instead of 18.😕
11. (Original post by Rakstar)
Ah nice one, hope you get the A*! I have got 93 or maybe above so yeah, A* for both of us fingers crossed!
What do you think the A* grade boundary will be?
12. (Original post by Smileyfacecloud)
I got 20 bags of crisps instead of 18.😕
I got 20 as well
13. Anyone got the exact colin question??
14. (Original post by ameenatariq)
What do you think the A* grade boundary will be?
Personally, the A* grade boundary is usually for a non-controversial, standard paper is 166 marks. However considering that non- calculator paper was much harder than usual and that the last question caught many people out, the grade boundary has to be around 163- 164 which is still higher than last years.
15. Wasn't the IQ range 131.5-124?
16. Pretty sure 24a is : -1/(3x + 4) (or 1/(-3x-4))
17. (Original post by Popz-)
Wasn't the IQ range 131.5-124?
No it's 133 - 122 = 11
18. (Original post by Rakstar)
Personally, the A* grade boundary is usually for a non-controversial, standard paper is 166 marks. However considering that non- calculator paper was much harder than usual and that the last question caught many people out, the grade boundary has to be around 163- 164 which is still higher than last years.
What about B what do you think it will be?
19. (Original post by Loubelhaj hhhhh)
I got 20 as well
Did you have the foundation paper?
20. (Original post by Rakstar)
Personally, the A* grade boundary is usually for a non-controversial, standard paper is 166 marks. However considering that non- calculator paper was much harder than usual and that the last question caught many people out, the grade boundary has to be around 163- 164 which is still higher than last years.
Really? There have been easier papers in the past with lower grade boundaries

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