A probability distribution in which mean is equal to variance is

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