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Po The length of human pregnancies is approximately normal with mean p = 266 days and standard deviation o = 16 days. What is the

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Po The length of human pregnancies is approximately normal with mean p = 266 days and standard deviation o = 16 days. What is the probability that a random sample of 18 pregnancies has a mean gestation period of 260 days or less? The probability that the mean of a random sample of 18 pregnancies is less than 260 days is approximately (Round to four decimal places as needed.)

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