A couple decides to keep having children until they have a boy, at which
point they will stop having children. They also agree to having a maximum
of three children. The table below shows the probability distribution of
X = the number of children such a couple would have.
X = # of children 1
2 3
1
1 1
P(X)
2 4 4
On average, how many children would such a couple have?
E(X) =
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children