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

=

262 days and standard deviation

=

20 days.

(a) What proportion of pregnancies lasts more than

297 days?

(b) What proportion of pregnancies lasts between

227 and

272 days?

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

257 days?

(d) A "very preterm" baby is one whose gestation period is less than

217 days. Are very preterm babies unusual?

Question content area bottomPart 1

(a) The proportion of pregnancies that last more than

297 days is

enter your response here

.

(Round to four decimal places as needed.)