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The owner of 5 retrievers throws a ball into a field, and one of the dogs...

The owner of 5 retrievers throws a ball into a field, and one of the dogs brings it back. He repeats this action until every dog has retrieved the ball at least once. Assuming that each dog has the same chance of getting the ball with each throw, calculate the mean and variance of the number of throws required.

Math   Statistics-And-Probability   
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