Question: Show that the mean of a hypergeometric random variable Y is = nr/N. Show that and then use the fact that is the hypergeometric

Show that the mean of a hypergeometric random variable Y is μ = nr/N. Show that (N 1-(r-1)) - 1- ( 1)/ nr N N. N-

and then use the fact that

is the hypergeometric probability distribution for Z = (Y - 1), where Z is the number of S’s in (n - 1) trials, with a total of (r - 1) S’s in (N - 1) elements.]

(N 1-(r-1)) - 1- ( 1)/ nr N N. N-

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