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A shipment of 80 burglar alarms contains 4 that are

A shipment of 80 burglar alarms contains 4 that are defective. If 3 from the shipment are randomly selected and shipped to a customer, find the probability that the customer will get exactly one bad unit using

(a) The formula of the hypergeometric distribution;

(b) The binomial distribution as an approximation.

(a) The formula of the hypergeometric distribution;

(b) The binomial distribution as an approximation.

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