(Answered) The lengths of pregnancies of an animal is approximately

Statistics

The lengths of pregnancies of an animal is approximately normally distributed with mean= 147 days and a standard deviation= 10 days

Complete parts ?(a) through ?(b).

?(a) What is the probability that a randomly selected pregnancy lasts less than 144 days?

(b) What is the probability that a random sample of 31 pregnancies has a mean gestation period of less than 144 ?days?

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