Type of random variables

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

A random variable X has the following distribution function: Find the mean and the variance of the random variable.

A random variable X has the following distribution function: Find the mean and the variance of the random variable x.

The variance of the random variable X is equal to

The variance of the random variable X having the following distribution

The probability distribution of a randoin variable X is given below i. Find k. ii. Find the variance of the random variable

Find the mean and variance of the random variable X which follows the following distribution.

Variance of random variable