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Edexcel IGCSE maths 1H 24th may 2018 unofficial markscheme

@Evil Homer
Please add and change to this markscheme:

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

16) 2/5h

19) 121/400
20) 3x+2y = 86
(edited 5 years ago)

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Original post by Daniellafreedman
@Evil Homer
Please add and change to this markscheme:

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
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
can you do the rest of the questions and also how did you get 2/5h for 16?
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
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
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
Reply 7
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)
Original post by Daniellafreedman
@Evil Homer
Please add and change to this markscheme:

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?
Reply 9
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
Reply 10
Grade boundaries?
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?
They'll be lower because many people found it hard

My guess is 85% for 9


Original post by sedders
Grade boundaries?
What did people get for the sin graph, a b and c values?
Reply 14
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
Reply 15
Original post by hanlanglois17
What did people get for the sin graph, a b and c values?

a = 2
b = 90
c = 1
Original post by hp20000
a = 2b = 90c =1


why was b=90 when the line had moved along two?
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
Original post by rahul.sagu
B is 60 - three squares = 90 degrees so 2/3 of 90 is 60


that's what i thought :/
What was was algebra one where it was to the ^-1/4 ??

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