Find the mean, variance and standard deviation of the number of tails in two tosses of a coin.

Calcuate the mean, variance and standard deviation of number of heads in two tosses of a coin.

Determine variance and standard deviation of the number of heads in three tosses of a coin.

Find the mean, variance and standard deviation of the number of heads in a simultaneous toss of three coins.

Find the expectation of the number of tails in 15 tosses of a coin.

Find the mean, variance and standard deviation of the number heads when three coins are tossed.

Find the mean,variance and standard deviation of first n natural numbers.

Find the mean and variance of the number of heads in the two tosses of a coin.

Find the mean and variance of the number of heads in the two tosses of a coin.

Find the mean and variance of the number of heads in the two tosses of a coin.

Find the mean,variance,standard deviation of number 6 in the two throws of a dice.