# Mean and Variance of Random Variables

Let X equal an integer selected at random from the first m positive integer, {1, 2, ..., m}.

(a) Give the values of E(X) and Var(X).

(b) Find the value of m for which E(X)=Var(X). (See Zerger in the references)

https://brainmass.com/statistics/probability/mean-variance-random-variables-254512

#### Solution Summary

The solution describes the determination of the mean and variance of a discrete random variable.

$2.19