Discrete Disteibutions
It is said that a ramdom variable X has a discrete distribution or that X is a discrete random variable if X can take only a finite number k of different values or, at most, an infinite sequence of different values Random variables that can take every value in an interval are called continuous and are discussed in Section 3.2.p.F) of X is defined as the function f such that for every real number x,
F(x)=Pr(X=x).