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The lengths of a particular animal's pregnancies are approximately normally distributed, with mean muequals254 days and...
The lengths of a particular animal's pregnancies are approximately normally distributed, with mean muequals254 days and standard deviation sigmaequals8 days. (a) What proportion of pregnancies lasts more than 268 days? (b) What proportion of pregnancies lasts between 248 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 234 days. Are very preterm babies unusual?
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