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trees 發問於 科學及數學數學 · 5 年前

2013 DSE Maths Paper 1 Q10

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  • tt33
    5 年前
    最愛解答

    10

    (a) :

    Required Median = 31

    Required Mode = 23

    (b)(i):

    (6x10+b) - (2x10+a) = 47

    40+a+b = 47

    a+b = 7

    ∵ 0 ≦ a ≦ 5

    7≦b ≦ 9

    ∴The solutions are a=0,b=7 / a=1,b=8 / a=2,b=9

    (b)(ii):

    Required probability =

    3+3+2+2+2+2+2x3+4x3÷13x20 = 8/65

    資料來源： Hope i can help you
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