Question 1172254
for 4 children the distribution for number of girls is
1--4---6---4---1
or 4C2(1/2)^2*(1/2)^2=6/16 or 3/8.
There is a 0.375 probability a randomly selected family has 2 girls.
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The wording isn't clear. The expected number of families with two girls is 24, 64*3/8.