The mean and variance of a binomial distribution are 8 and 4 respectively. Then P(X=1) is equal to

The height of persons in a country is a random variable of the type

E(X−k)² is minimum when

Var(2X± 3) if Var(X)=1 is

For two random variables X and Y, the relation E(XY)=E(X)E(Y) holds good

If P₁ (x) and P₂ (x) be the marginal probability functions of two independent discrete random variables X and Y, then their joint probability function P(x,y)=