Question: A certain couple is equally likely to have either a boy child or a girl child. If the family has four children, let X denote the number of girls.
(a) Identify the possible values of the random variable X.
(b) Determine the probability distribution of X. (Hint: There are 16 possible equally-likely outcomes. One is GBBB, meaning the first born is a girl and the next three born are boys.)
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