If the variance of the random variable `X` is `5` ,then variance of the random variable `-3X` is

If the variance of the random variable X is 9 the S.D .of the random variable -4X+8 is

Discrete random variable

Variance of a discrete random variable

Mean of a discrete random variable

If variance of variable is 50 then x=

A person on a high protein diet is interested in the random variable X, the gain in weight in a week. Then the random variable is

Let a pair of dice he rolled thrice and the random variable X be the number of doublets. Find the mean of the random variable.

A random variable is said to be discrete, if

A random variable X has the distribution. Then , variance of the distribution, is