Calculate the mean and variance
An urn contains originally 2 red chips and 3 white chips. A chip is drawn at the random and replaced by chip of opposite color. Let X by the number of red chips after 4 draws. Find out the p.m.f. of X and calculate the mean and variance of X.
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Employ a generating function for modeling the number of distributions of 18 chocolate bunny rabbits into four Easter baskets with at least 3 rabbits in each basket. Which coefficient do we want?
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