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by EnriqueA on February 1st, 2008

EnriqueA

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Math problem: A woman is expecting a baby. 50/50 chance it's a girl. .05% chance it's mentally challenged. What is the chance that it's a mentally challenged female?

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  • by iwnit on February 1st, 2008

    iwnit

    It is not possible to answer the question, because if only males could be mentally challenged, for instance, it would never happen.

    So we need to know the chance that a girl is mentally challenged. (the chance for a boy could then be calculated from the data).

    ---- ADDED because of the new information -------
    New information: There is a .05% chance that any child, boy or girl, will be mentally challenged.

    So we have 50% chances for a girl and this girl has .05% chances to be mentally challenged.
    That makes .025% chances for a mentally challenged girl. I hope there is no flaw here.
    (I assume the question is asked for the baby, not for the mother)

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