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9 November, 15:29

In a certain country, the true probability of a baby being a boy is 0.514. among the next nine randomly selected births in the country, what is the probability that at least one of them is a girl ?

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  1. 9 November, 17:22
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    The probability of a baby being a boy is 0.514.

    Nine baby births are selected and we have to find the probability that at last one of them is a girl.

    P (At least one out of 9 is baby girl) = 1 - P (No baby girl)

    = 1 - P (All 9 are baby boy)

    = 1 - (0.514) ^9

    = 1 - 0.0025

    = 0.9975

    The probability that at least one out of 9 selected births is baby girl is 0.9975
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