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# Edexcel IGCSE maths 1H 24th may 2018 unofficial markscheme watch

1. Evil Homer

1a) modal class 0-1
1b) 1.4
2) 510

16) 2/5h

19) 121/400
20) 3x+2y = 86
2. (Original post by Daniellafreedman)
Evil Homer

1a) modal class 0-1
1b) 1.4
2) 510

16) 2/5h

19) 121/400
20) 3x+2y = 86
For q19 that was the probability for one game, but you have to square it to calculate the probability of Jack winning both = (121/400)^2
3. (Original post by rahul.sagu)
For q19 that was the probability for one game, but you have to square it to calculate the probability of Jack winning both = (121/400)^2
No probability of winning one game was 1/10 plus 9/20 which is 11/20 . Then you square 11/20 to get 121/400
4. can you do the rest of the questions and also how did you get 2/5h for 16?
5. (Original post by Daniellafreedman)
No probability of winning one game was 1/10 plus 9/20 which is 11/20 . Then you square 11/20 to get 121/400
I realised I squared it for no reason. Oh well, that's like 3/4 marks then
6. (Original post by Daniellafreedman)
No probability of winning one game was 1/10 plus 9/20 which is 11/20 . Then you square 11/20 to get 121/400
Just realised I squared it for no reason... Oh well, that's 3/4 marks probably
7. (Original post by rahul.sagu)
I realised I squared it for no reason. Oh well, that's like 3/4 marks then
Yeah you'll only lose like 1
8. Question on film - No to 35% as only 24 films were more than 120 minutes long

ABE was straight line AE was 30x AB with common point A

Perimeter of shape was 110

Original salary was 240,000 HKS

Venn diagram last question was correct as A and C had no common member

common denominator q was 7-3x/2(x+3)(x-5) [just remember the top part for sure, bottom could be -/+ the other way round)
9. (Original post by Daniellafreedman)
Evil Homer

1a) modal class 0-1
1b) 1.4
2) 510

16) 2/5h

19) 121/400
20) 3x+2y = 86
I got 1.5x + 1y = 43 for 20 do you think I'll still get the marks?
10. Q16 Frustum was Vol frustum 98 : vol cone 125. Small cone similar to large cone = 125-98=27 cube root of 27/125 is 3/5 for height of small versus large cone, thus frustum 1-small cone i.e. 1-3/5 ie 2/5h or 0.4h
12. Not all the marks because it asked for answers in whole numbers
(Original post by GalaxySearcher)
I got 1.5x + 1y = 43 for 20 do you think I'll still get the marks?
13. They'll be lower because many people found it hard

My guess is 85% for 9

(Original post by sedders)
14. What did people get for the sin graph, a b and c values?
15. (Original post by hanlanglois17)
What did people get for the sin graph, a b and c values?
I had no idea how that was done
I wrote like 0 90 and 360 I think
16. (Original post by hanlanglois17)
What did people get for the sin graph, a b and c values?
a = 2
b = 90
c = 1
17. (Original post by hp20000)
a = 2b = 90c =1
why was b=90 when the line had moved along two?
18. (Original post by hanlanglois17)
why was b=90 when the line had moved along two?
B is 60 - three squares = 90 degrees so 2/3 of 90 is 60
19. (Original post by rahul.sagu)
B is 60 - three squares = 90 degrees so 2/3 of 90 is 60
that's what i thought :/
20. What was was algebra one where it was to the ^-1/4 ??

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