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22 March, 13:50

In a family of 4 children, what is the probability that all four will be girls?

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  1. 22 March, 15:03
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    Assume that the probability of either gender of a newborn is 50-50.

    Then ...

    The probability of the first child being a girl is 0.5.

    The probability of the second child being a girl is 0.5.

    The probability of the third child being a girl is 0.5.

    The probability of the fourth child being a girl is 0.5.

    The probability of all four being girls is (0.5) x (0.5) x (0.5) x (0.5) =

    (0.5) ⁴ = 0.0625 = 6.25% = 1/16.
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