Question 5 Of 15 = Quiz: Quiz 5 This quest The lengths of a particular animal's pregnancies are approximately normally distributed, with mean u = 278 days and standard deviation o = 8 days. (a) What proportion of pregnancies lasts more than 284 days? (b) What proportion of pregnancies lasts between 268 and 282 days? (c) What is the probability that a randomly selected pregnancy lasts no more than 276 days? (d) A "very preterm" baby is one whose gestation period is less than 258 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 284 days is (Round to four decimal places as needed.) (b) The proportion of pregnancies that last between 268 and 282 days is (Round to four decimal places as needed.) (c) The probability that a randomly selected pregnancy lasts no more than 276 days is. (Round to four decimal places as needed.) (d) A "very preterm" baby is one whose gestation period is less than 258 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.)