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

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    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
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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
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    (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
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    can you do the rest of the questions and also how did you get 2/5h for 16?
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    (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
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    (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
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    (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
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    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)
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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
    I got 1.5x + 1y = 43 for 20 do you think I'll still get the marks?
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    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
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    Grade boundaries?
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    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?
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    They'll be lower because many people found it hard

    My guess is 85% for 9


    (Original post by sedders)
    Grade boundaries?
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    What did people get for the sin graph, a b and c values?
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    (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
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    (Original post by hanlanglois17)
    What did people get for the sin graph, a b and c values?
    a = 2
    b = 90
    c = 1
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    (Original post by hp20000)
    a = 2b = 90c =1
    why was b=90 when the line had moved along two?
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    (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
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    (Original post by rahul.sagu)
    B is 60 - three squares = 90 degrees so 2/3 of 90 is 60
    that's what i thought :/
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    What was was algebra one where it was to the ^-1/4 ??
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