The lengths of a particular animal's pregnancies are approximately normally distributed, with mean p = 265 days and standard deviation o = 12 days. (a) What proportion of pregnancies lasts more than 268 days? (b) What proportion of pregnancies lasts between 262 and 274 days? (c) What is the probability that a randomly selected pregnancy lasts no more than 250 days? (d) A "very preterm" baby is one whose gestation period is less than 238 days, Are very preterm babies unusual? Click the icon to view a table of areas under the normal curve. (a) The proportion of pregnancies that last more than 268 days is (Round to four decimal places as needed ) (b) The proportion of pregnancies that last between 262 and 274 days is (Round to four decimal places as needed. ) (c) The probability that a randomly selected pregnancy lasts no more than 250 days is (Round to four decimal places as needed.) (d) A "very preterm" baby is one whose gestation period is less than 238 days Are very preterm babies unusual? The probability of this event is , so it be unusual because the probability is than 0 05, (Round to four decimal places as needed. )