We consider a random experiment which consists in crossing two yellow mice. The number X of yellow descendants among n = 3 descendants is a random variable with the (cumulative) distribution function below. What is the variance of the number of yellow offspring randomly chosen from n = 3 offspring? (Hint; First determine the density function of the probabilities of X).

0 1 2 3 F(a) 1/27 7/27 19/27 1