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2017 Edexcel GCSE Maths 9-1 Paper 3 (Higher) Unofficial Mark Scheme

This poll is closed

How many marks do you think you got?

0-10 3%

11-20 4%

21-30 11%

31-40 14%

41-50 15%

51-60 17%

61-70 19%

71-8019%

Total votes: 4433

hebeb

Looking for the 2018 Edexcel Paper 3 Unofficial Markscheme find it here!

Here are worked solutions (not mine): https://www.thestudentroom.co.uk/attachment.php?attachmentid=663076&d=1497372272
Let me know if I'm wrong as always :wink:

Marks for each question aren't definitely right - I haven't seen the paper yet, so take them with a pinch of salt, they'll be off by 1-2 marks here and there.

1. (a) Complete Venn diagram (4 marks)
(b) 7/15 (2 marks)
2. x = -2/3; y =-2 (3 marks)
3. 68 lemon cakes (5 marks)
4. Prove that P is a hexagon: find exterior angle = 60°. 360/60 = 6 sides therefore hexagon. Alternatively find interior angle = 120°, its regular therefore it's a hexagon (4 marks)
5. (a) Median dress size = 12 (2 marks)
(b) Zoe is wrong because the events are independent (1 mark)
6. Combinations - the guy is wrong - can't be 215 combinations because 215 doesn't divide by 17 (2 marks)
7. Density of new drink = 1.01g/cm^3 (4 marks)
8. Compound interest - x = 6% (3 marks)
9. Length of side of square in circle = 5.59cm (4 marks)
10. Length of x = 5.86 cm (SOHCAHTOA) (3 marks)
11. (a) Box plot - interquartile range = £180 (2 marks)
(b) Draw box plot (2 marks)
(c) The person is correct, the girls spent more because the median was higher (1 mark)
12. AB:BC:CD = 3 : 4 : 11 (3 marks)
13. (a) Simplify - (x+4)/(2x+3) (2 marks)
(b) v = 15t/(w+30) (2 marks)
14. Inequalities that define region: y>=x; y<=1/2x+1; y>=-2 (4 marks)
15. Find x given area of triangle: x=2.63cm (5 marks)
16. (a) Bounds - must be less than 160, upper bound is 153km/h (4 marks)
(b) would make no difference to the decision, still less than 160km/h; upper bound decreases (1 mark)
17. (a) Iteration - x1 = -2.64; x2 = -2.57; x3 = -2.60 (3 marks)
(b) significance to equation: approximate roots; x3 is more accurate than x1 (2 marks)
18. Arc length = 21.6cm (5 marks)
19. X < -2; x > 1/2 (3 marks)
20.(a) Co ordinates of y intercept = (0,1) (1 mark)
(b) Draw circle on graph - x intercepts (-1,0) and (7,0); centre (3,0) (3 marks)

Thanks to everyone who's given me answers :smile:

(edited 6 years ago)

Scroll to see replies

Reply 1

hebeb

Original post by joefitz123

Is the 21.6 answer the arc length?

Yes sorry, but I can't vouch for its accuracy because it's not my answer, I got that one wrong ha

Reply 2

IsaacRay

Original post by hebeb

Any help with the gaps would be good, and let me know if I'm wrong as always :wink:

1. (a) Complete Venn diagram (4 marks)
(b) 7/15 (2 marks)
2. x = 2/3; y =-2 (3 marks)
3. 68 lemon cakes (5 marks)
4. Prove that P is a hexagon (4 marks)
5.
6.
7. Density of new drink = 1.01g/cm^3
8. Compound interest - x = 6%
9. Length of side of square = 5.59cm
10. Length of x = 5.86 cm (SOHCAHTOA)
11. (a) Box plot - interquartile range = £180
(b) Draw box plot
(c) The person is correct, the girls spent more because the median was higher
12. AB:BC:CD = 3:4:11
13. (a) Simplify - (x+4)/(2x+3)
(b) v = 15t/(w-30)
15.
16. (a) Bounds - must be less than 160, upper bound is 153km/h
(b) would make no difference to the decision, still less than 160km/h; upper bound decreases
17. (a) Iteration - x1 = -2.64; x2 = -2.57; x3 = -2.60
(b) significance to equation: approximate roots; x3 is more accurate than x1
18. Arc length = 21.6cm
19. X < -2; x > 1/2
20.(a) Co ordinates of y intercept = (0,1)
(b) Draw circle on graph - x intercepts (-1,0) and (7,0)

I thought the venn diagram probability was 1 /15 (as only one 15 was inside the intersect?)

Reply 3

hebeb

Original post by IsaacRay

I thought the venn diagram probability was 1 /15 (as only one 15 was inside the intersect?)

No sorry, it wanted the union which is A OR B

Reply 4

12spowell

Original post by hebeb

Any help with the gaps would be good, and let me know if I'm wrong as always :wink:

1. (a) Complete Venn diagram (4 marks)
(b) 7/15 (2 marks)
2. x = 2/3; y =-2 (3 marks)
3. 68 lemon cakes (5 marks)
4. Prove that P is a hexagon (4 marks)
5.
6. The guy is wrong - can't be 215 combinations because 215 doesn't divide by 17
7. Density of new drink = 1.01g/cm^3
8. Compound interest - x = 6%
9. Length of side of square = 5.59cm
10. Length of x = 5.86 cm (SOHCAHTOA)
11. (a) Box plot - interquartile range = £180
(b) Draw box plot
(c) The person is correct, the girls spent more because the median was higher
12. AB:BC:CD = 3:4:11
13. (a) Simplify - (x+4)/(2x+3)
(b) v = 15t/(w-30)
15.
16. (a) Bounds - must be less than 160, upper bound is 153km/h
(b) would make no difference to the decision, still less than 160km/h; upper bound decreases
17. (a) Iteration - x1 = -2.64; x2 = -2.57; x3 = -2.60
(b) significance to equation: approximate roots; x3 is more accurate than x1
18. Arc length = 21.6cm
19. X < -2; x > 1/2
20.(a) Co ordinates of y intercept = (0,1)
(b) Draw circle on graph - x intercepts (-1,0) and (7,0)

I think that for 12 its 3:4:11

Reply 5

B-122

Original post by IsaacRay

I thought the venn diagram probability was 1 /15 (as only one 15 was inside the intersect?)

I thought the lemon cakes were 87

Reply 6

ethann

On the 215 combinations did the person's statement say when there are 17 trees and 1 tree or was it always 17 and some?

Reply 7

AIR127

I think y = -2 and x = -2/3 for the simultaneous equation

Reply 8

IsaacRay

Original post by hebeb

No sorry, it wanted the union which is A OR B

It was: A ∩ B

and only 15 was in both sets...?

Reply 9

Shanpatel00

Original post by 12spowell

I think that for 12 its 3:4:11

yes it was

Reply 10

dinaaa12345

if i got like 20-30 marks on each paper, what grade would i get? bad marks ik

Reply 11

MolsyT

For question 2 it is -2/3

Reply 12

iLegend123

Thanks hebeb, I got all of these answers except zoe is wrog because they are not mutually exclusive. Also you cant tell whether the girls spent more as you dont kknow how many girls there were