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18 August, 17:47

Three families each have three sons and no daughters. Assuming boy and girl babies are equally likely, what is the probability of this event?

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  1. 18 August, 20:58
    0
    Three families with three children all boys

    parents-2

    children-3

    total-5 times 3 = 15

    then boys-3 times three=9

    Answer: 9/12

    Percentage:75%
  2. 18 August, 21:25
    0
    I don't think it matters how many families are involved.

    You're talking nine live births, and the probability of a

    male birth each time is 50%.

    So the probability of nine males in nine births is

    (1/2) ^9 = 1/512 = about 0.195 percent (rounded)
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