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
P(X)
1
2
1
4
1
4
On average, how many children would such a couple have?
E(X) =
children