Question: A random sample of size n is drawn without replacement from an urn containing r red chips and w white chips. Define the random variable

A random sample of size n is drawn without replacement from an urn containing r red chips and w white chips. Define the random variable X to be the number of red chips in the sample. Use the summation technique described in Theorem 3.5.1 to prove that E(X) = rn/(r +w).

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