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

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 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 99 times. Let x be the number of times heads occurs. Then P(X=r) is maximum when r is .

A fair coin is tossed 99 times. If X is the number of times in which head occurred, then P(X = r) is maximum when r is equal to

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 fair coin is tossed four xx.Let X denote the number of heads occurring.Find the probability distribution,mean and variance of X.

A fair coin is tossed 9 times. The probability that it shows heads in the first four tosses and tails in the last five tosses is