The lengths of a particular animal's pregnancies are approximately normally distributed, with mean µ=279 days and standard deviation = 16 days. (a) What proportion of pregnancies lasts more than 291 days? (b) What proportion of pregnancies lasts between 271 and 283 days? (c) What is the probability that a randomly selected pregnancy lasts no more than 267 days? (d) A "very preterm" baby is one whose gestation period is less than 255 days. Are very preterm babies unusual? (a) The proportion of pregnancies that last more than 291 days is (Round to four decimal places as needed.)

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