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?
by 
EnriqueA
ANSWERS: 5
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depends on the parrents, and if the father does anything to the baby.
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about 90%
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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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Use a prob tree: Male NMC --> .5 * .9995 = .49975 Female NMC --> .49975 Male MC --> .025 Female MC --> .025 Thus and female MC = .025 or 2.5%
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Well... there is an even chance that a mentally challenged baby is either a boy or a girl. Since in total there is a .05% chance of a mentally challenged child, there is a .025% chance that it is a girl because that is half of .05%. Is that right?
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