In: Statistics and Probability
The lengths of a particular animal's pregnancies are approximately normally distributed, with mean
muμequals=273
days and standard deviation
sigmaσequals=20 days.(a) What proportion of pregnancies lasts more than 308 days?(b) What proportion of pregnancies lasts between 248 and 288 days (c) What is the probability that a randomly selected pregnancy lasts no more than 268 days? (d) A "very preterm" baby is one whose gestation period is less than
243 days. Are very preterm babies unusual?