The Statistics package includes 9 discrete probability distributions and commands for manipulating and creating discrete random variables.
Consider a binomial random variable. Unlike continuous random variables, discrete random variables are defined by their probability function rather than their probability density function.
The Statistics package also allows for both numeric and symbolic manipulation of random variables and distributions. Consider the negative binomial distribution with symbolic parameters.
Further, the Statistics package supports the probability table. This distribution is used to associate probabilities with the integers 1..n, for any n. Consider a case of n = 5.
The Statistics package also supports the empirical distribution, which is effectively a probability distribution built around a data sample. The probability of each element is equal to its frequency in the data sample.