Question: 5.54 According to a study published by a group of University of Massachusetts sociologists, about twothirds of the 20 million persons in this country who

5.54 According to a study published by a group of University of Massachusetts sociologists, about twothirds of the 20 million persons in this country who take Valium are women. Assuming this figure to be a valid estimate, find the probability that on a given day the fifth prescription written by a doctor for Valium is

(a) the first prescribing Valium for a woman;

(b) the third prescribing Valium for a woman.

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