A fair coin is tossed 4 times. If X denotes the number of heads obtained, then the formula for p.m.f. of X is

A fair coin is tossed 6 times .The variance of number of heads is

A fair coin is tossed 4 times.Let X denotes the number of heads obtained.Write down the probability distribution of X.Also find the formula for pmf of X.

A fair coin is tossed 3 times. Let X be the number of heads obtained. Find E(X) and V(X).

A fair coin is tossed 3 times. Let X be the number of heads obtained. Find E(X) and V(X).

A coin is tossed 4 times. Let X denote the number of heads. Find the probability distribution of X, its mean and variance.

A coin is tossed 4 times. Let X denote the number of heads. Find the probability distribution of X. Also, find the mean and variance of X.

A biased coin with probability of getting head is twice that of tail, is tossed 4 times If a random variable X is number of heads obtained, then expected value of X is :

A biased coin with probability of getting head is twice that of tail, is tossed 4 times If a random variable X is number of heads obtained, then expected value of X is :