Discrete Random Variables:Concepts A discrete random variable is a real-valued function of the outcome of a discrete experiment A discrete random variable has an associated probability mass function(PMF),which gives the probability of each numerical value that the random variable can take. A function of a discrete random variable defines another discrete random variable,whose PMF can be obtained from the PMF of the original random variable.Discrete Random Variables: Concepts  A discrete random variable is a real-valued function of the outcome of a discrete experiment.  A discrete random variable has an associated probability mass function (PMF), which gives the probability of each numerical value that the random variable can take.  A function of a discrete random variable defines another discrete random variable, whose PMF can be obtained from the PMF of the original random variable