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.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 6 times .The variance of number of heads is

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 four times. Let X denote the number of heads occurring. Find the probability distribution, mean and variance of X.

A fair coin is tossed 99 times . Let X be the number of times heads occur. Then P(X=r) is maximum when r 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. Let X be the number of times head occurs. The P(X=r) maximum when r is

A fair coin is tossed 99 times. Let X be the nunber of times head occurs. Then P(X=r) is maximum when r is

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