statistics
posted by tim .
Five percent of all items sold by a mailorder company are returned by customers for a refund. Find the probability that of two items sold during a given hour by this company both will be returned for a refund

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an average of 0.56 defects per 500 yards. Using the Poisson formula, find the probability that the number of defects in a given 500yard piece of this fabric will be more than 3
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