Question

construct a probability distribution for a family of 3 children. Let X represent the number of boys

Answer 1

P(X = 0) = 1/8
P(X = 1) = 3/8
P(X = 2) = 3/8
P(X = 3) = 1/8

Answer 2

because of the possible outcomes of having XXX then sub those as MMM and distribute if you have a female then you will add F so it will be MMF or MFM etc