k = qhypg(p,n,K,N)
Input p probability (scalar, vector or matrix)
n,K,N nonnegative integers such that
n<= N, K<= N and n-k<= N-K
N is the total number of elements of the population
n is the number of elements which are randomly
extracted
K is the number of elements of the population which
have the studied property
Output k for each p, k is the smallest integer j so
that P(X <= j) >= p.