A population of N alligators are to be sampled to obtain a measure of the diff between the proportion of male and females. assume that n animals are to be sampled without replacement. let Y1 denote the no of females and Y2 the number of males. if the population contains proportions p1 and p2 of females and males, find

E(Y1/n-Y2/n) and V(Y1/n-Y2/n)