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Math Help - Hypergeometric conditional variance formula

  1. #1
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    Hypergeometric conditional variance formula

    I know the unconditional variance formula of the form:

    ((n)(r)(N-r)(N-n)) / ((N)(N)(N-1))

    So, what is the variance formula conditioned on 1 or 2 items - particularly when there's 3 different items to choose from ?
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  2. #2
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    Re: Hypergeometric conditional variance formula

    Hey TheCountador.

    Consider finding the random Z where Z is the distribution when conditioned and then get Var[Z] = E[Z^2] - E[Z]^2 using standard formulae.
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