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The lengths of a particular animal's pregnancies are approximately normally distributed, with mean

days and standard deviation

days.

(a) What proportion of pregnancies lasts more than 290 days?

(b) What proportion of pregnancies lasts between 254 and 278 days?

(c) What is the probability that a randomly selected pregnancy lasts no more than 248 days?

(d) A "very preterm" baby is one whose gestation period is less than 242 days. Are very preterm babies unusual?


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