Mathematics, 27.05.2020 19:05, PONBallfordM89

Ron Blake, a personnel director, wants to study the accuracy level of his company's 70 secretaries. Historically, the number of word processing errors made each day by each secretary had been approximately normal with an average of eighteen, and a population standard deviation of four. Mr. Blake monitors a sample of fifteen randomly chosen secretaries today. What is the probability that the average number of errors per secretary is greater than 20

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Ron Blake, a personnel director, wants to study the accuracy level of his company's 70 secretaries....