At every hour, five packets of sweets are to be randomly selected for inspection at a food & chocolate factory. Suppose that at every hour, twenty packets of sweets are manufactured, where twelve of them are Skittles and the other eight are Smarties. Let X denote the number of Skittle packets selected for inspection. a) The probability mass function to calculate P(X=x) is equal to.. b) The expected value of X, E(X) is equal to.. c) The variance of X, Var(X) is equal to ... d) The probability that only 2 packets of Skittles will be selected is equal to.. e) The value of the population size N is equal to... f) The value of the fixed sample size n is equal to... g) The value of the parameter M is equal to