Type of random variables

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

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

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

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

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

The probability distribution of a random variable is given by p(x) . What is sumP(x) ?

Which of the following distribution of probabilities of a random variable X is the probability distribution ?

The probability function of a random variable is defined as Then E(X) is equal to