NICK LORD, Discrete random variables having equal mean and variance, The Mathematical Gazette, Vol. 98, No. 542 (July 2014), pp. 347-349 ...

In a number of situations we are faced with the problem of determining efficient estimates of the mean and variance of a distribution specified by (i) a non-zero probability that the variable assumes ...

A random variable is one whose value is unknown or a function that assigns values to each of an experiment’s outcomes. A random variable can be discrete or continuous.