HypergeometricDistribution¶

Hypergeometric probability distribution: n draws without replacement from a population of nt items containing ns successes.

$ wo 'HypergeometricDistribution[n, ns, nt]'
HypergeometricDistribution[n, ns, nt]

The mean is (n*ns)/nt:

$ wo 'Mean[HypergeometricDistribution[n, ns, nt]]'
(n*ns)/nt

Concrete parameters collapse to an exact number:

$ wo 'Mean[HypergeometricDistribution[5, 10, 50]]'
1