Variance of a discrete random variable

Mean of a discrete random variable

Obtain mathematical expectation and variance of the discrete random variable X which denotes the minimum of two numbers that appear when a pair of fair dice is tossed once.

If mu " and " sigma^(2) are the mean and variance of the discrete random variable X, and E(X+3)=10 and E(X+3)^(2)=116 , find mu " and " sigma^(2) .

The probability distribution of a discrete random variable x is given as under Calculate (i) the value of A, if E(X)=2.94. (ii) variance of X.

The probability distribution of a discrete random variable x is given as under Calculate (i) the value of A, if E(X)=2.94. (ii) variance of X.

The probability distribution of a discrete random variable X is given as under : Calculate : (i) The value of A if E(X) = 2.94 (ii) Variance of X

The probability distribution of a discrete random variable X is given below : The value of k is

The probability distribution of a discrete random variable X is given below: The value of k is

The probability distribution of a discrete random variable X is given below : The value of k is .........