The lengths of a particular animal s pregnancies are approximately normally distributed with mean 276 days and standard deviation o 16 days a What proportion of pregnancies lasts more than 288 days b What proportion of pregnancies lasts between 264 and 284 days c What is the probability that a randomly selected pregnancy lasts no more than 244 days d A very preterm baby is one whose gestation period is less than 252 days Are very preterm babies unusual a The proportion of pregnancies that last more than 288 days is Round to four decimal places as needed b The proportion of pregnancies that last between 264 and 284 days is Round to four decimal places as needed c The probability that a randomly selected pregnancy lasts no more than 244 days is Round to four decimal places as needed d The probability of a very preterm baby is This event than 0 05 Round to four decimal places as needed unusual because the probability is