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Math Help - NEED UNIT 4 PDF for DATA MANAGEMENT through ILC

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    gta
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    Data management

    Hi, my name is Andria. I have solved a question in data management. I thought I was on the right track, based on my lesson book. But my work and answer is different than those of others...and I don't understand what other people are doing when I read their threads. Pls help:

    From a box of 12 flares, four are selected at random.

    a) If the box contains four flares that do not work, the probability that all four will not work is 20.2%:

    a = 4 x = 4 N = 12 n = 4

    p(x) = (C(a,x))(C(N-a,n-x)) / C(N,n)

    = (C(4,4))(C(12-4,4-4)) / C(12,4)

    = (C(4,4))(C(8,0)) / C(12,4)

    = 0.002020 or 0.2%
    Last edited by andi; August 15th 2012 at 02:59 PM.
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