A coin is tossed thrice. X denotes the no. of heads appeared. Find the mean and variance of X.

A die is tossed thrice . A success I is or 6 on a toss. Find the mean and variance of successes.

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 coin is tossed thrice. If event E denotes the number of heads is odd and event F denotes the number of tails is odd, then find the cases favourable to the event EnnF .

Three coins are tossed simultaneously.X is the number of heads.Find expected value and variance of X.

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

Three coins are tossed together. If X denotes the numbers of heads obtain on it. Then obtain mean, variance and standard deviation of distribution.