Year 12s: what will be the first way you research your future options? >>

Edexcel IGCSE maths 1H 24th may 2018 unofficial markscheme

Scroll to see replies

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

what about the domain one? was x bigger than and equal to 19 or just bigger than

Reply 21

fdandrews

Original post by Oskar123

what about the domain one? was x bigger than and equal to 19 or just bigger than

greater than or equal to

Reply 22

hp20000

Original post by hanlanglois17

that's what i thought :/

B was 90 becuase the whole line had moved upwards by 1, so although when it crossed the x axis it was 60 out, when it crossed the line y=1 it was 90 out

Reply 23

gcsessssss

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

question 2 it asked for the number of adults, can't remember my exact answer but i think it was not 510

Reply 24

Goshry464

Original post by hanlanglois17

why was b=90 when the line had moved along two?

Could you explain by a was 2? Couldn’t figure that part out but got the other two, thank you!

Reply 25

hanlanglois17

Original post by Goshry464

Could you explain by a was 2? Couldn’t figure that part out but got the other two, thank you!

The wave had been stretched by a scale factor of two

Reply 26

sedders

What was the answer to the interest question?

Reply 27

hp20000

Original post by Goshry464

Could you explain by a was 2? Couldn’t figure that part out but got the other two, thank you!

Normal sin(x) spans from 1 to -1, 2sin(x) spans from -2 to 2. It was then just moved up 1 space so it spanned from -1 to 3

Reply 28

hp20000

Original post by gcsessssss

question 2 it asked for the number of adults, can't remember my exact answer but i think it was not 510

3/5 were children, 2/5 were adults
children to adults = 3:2 = 9:6
girls to boys were 2:7
2+7 = 9 so girls:boys:adults was 2:7:6
170 girls /2 = 85
85*6 = 510 adults

Reply 29

hp20000

Original post by fdandrews

greater than or equal to

no only greater than as sqrt(19-19) = 0, which is possible.

Reply 30

hp20000

Original post by sedders

What was the answer to the interest question?

the boat depreciating in value over 3 years was 160000*(0.96)^3 = 141,558 ( to the nearest HKD)

the pay rise was 252000/1.05 = 240000

Reply 31

HowManyThrowaway

What did people get for the perimeter question? The triangles

Reply 32

Oskar123

Original post by HowManyThrowaway

What did people get for the perimeter question? The triangles

110

Reply 33

HowManyThrowaway

Do you guys have any ideas of what the grade boundaries will be for this paper?

Reply 34

Goshry464

Original post by hp20000

Normal sin(x) spans from 1 to -1, 2sin(x) spans from -2 to 2. It was then just moved up 1 space so it spanned from -1 to 3

Ah perfect thank you, I just couldn’t work out the relationship between the two graphs!

Reply 35

fiddletrio

Original post by Munrhe

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)

the first one is wrong, the answer was yes, because 37.5% of the films were more than 120 mins long because u have to use the cumulative frequency graph to show u

Reply 36

Harrismier123

No just greater than becuase you are able to square root 0

Reply 37

j.rtm_

Original post by GalaxySearcher

I got 1.5x + 1y = 43 for 20 do you think I'll still get the marks?

well the question did say "so that a b and c are integers", so idk

Reply 38

Goshry464

Original post by fiddletrio

the first one is wrong, the answer was yes, because 37.5% of the films were more than 120 mins long because u have to use the cumulative frequency graph to show u

No I’m pretty sure they’re right because I went to whatever percentage it was on the graph and it was like 107 minutes or something like that which was defineltly less than 120 minutes. Therefore it must have been wrong.