19 of 21 (15 complete) HW Score: 48.89%, 1 7.2.41 Question The lengths of a particular animal's pregnancies are approximately normally distributed, with mean u = 250 days and standard deviation o = 8 days. (a) What proportion of pregnancies lasts more than 260 days? (b) What proportion of pregnancies lasts between 236 and 256 days? (c) What is the probability that a randomly selected pregnancy lasts no more than 246 days? (d) A "very preterm" baby is one whose gestation period is less than 232 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 260 days is (Round to four decimal places as needed.)