statistic
posted by Kim .
The random variable x represents the number of boys in a family with three children.
Assuming that births of boys and girls are equally likely, find the mean and standard
deviation for the random variable x.

statistic 
MathMate
This is a binomial distribution with parameters
n=3 (number of trials in the experiment)
p=1/2 (probability of boys, X)
q=1p (probability of girls)
For a random variable X with a binomial distribution (n,p,q), then
E(x)=μ=np
σ²=npq
where σ=standard deviation (of population)
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