PMF
Suppose that a sample of size $n$ is to be chosen randomly (without replacement) from an urn containing $N$ balls, of which $m$ are white and $N-m$ are black. If we let $X$ denote the number of white balls selected, then $$f(x; N, m, n) = \Pr(X = x) = {{m\choose x}{N-m\choose n-x}\over {N\choose n}}$$ for $x= 0, 1, 2, \cdots, n$.Suppose that a sample of si
