A husband and wife are planning on having three children. Boys and girls are equally
likely to be born.
a. Give the sample space for the genders of all three children. (The order of the
children makes a difference)
b. What is the probability that all three children are girls?
c. Let X = # boys among the three children. Give the distribution of X.
d. Calculate the mean number of boys.
e. Is X a binomial variable?
