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Test 3 Question 5
Test 3
5. The lengths of a particular animal’s pregnancies are approximately normally distributed, with mean ì=280 days and standard deviation ó=20 days.
(a) What proportion of pregnancies lasts more than 290 days?
(b) What proportion of pregnancies lasts between 270 and 285 days?
(c) What is the probability that a randomly selected pregnancy lasts no more than 265 days?
(d) A “very preterm” baby is one whose gestation period is less than 250 days. Are very preterm babies unusual?