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Math Help - Simple Stats

  1. #1
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    Simple Stats

    Can't think at the moment and need some help.

    Approx 51% off all births in the U.S. are boys.

    If a woman has 3 children, find the probability that she does not have all boys.

    All outcomes are not equally likely, so it can't just be 7/8, right?

    Thanks in advance.
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  2. #2
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    Would it be the complement of her having all boys? 0.51 * 0.51 * 0.51 = 0.13.
    1-0.13 = 0.87?
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  3. #3
    MHF Contributor
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    Quote Originally Posted by zsig013 View Post
    Would it be the complement of her having all boys? 0.51 * 0.51 * 0.51 = 0.13.
    1-0.13 = 0.87?
    Yes, that method works.
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