The lengths of a particular animal's pregnancies are approximately normally distributed, with mean u = 250 days and stan

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The Lengths Of A Particular Animal S Pregnancies Are Approximately Normally Distributed With Mean U 250 Days And Stan 1 (131.03 KiB) Viewed 30 times

The lengths of a particular animal's pregnancies are approximately normally distributed, with mean u = 250 days and standard deviation o = 8 days. (a) What proportion of pregnancies lasts more than 260 days? (b) What proportion of pregnancies lasts between 238 and 254 days? (c) What is the probability that a randomly selected pregnancy lasts no more than 234 days? (d) A "very preterm" baby is one whose gestation period is less than 232 days. Are very preterm babies unusual? (a) The proportion of pregnancies that last more than 260 days is (Round to four decimal places as needed.) (b) The proportion of pregnancies that last between 238 and 254 days is (Round to four decimal places as needed.) (c) The probability that a randomly selected pregnancy lasts no more than 234 days is (Round to four decimal places as needed.) This event unusual because the probability is than 0.05. (d) The probability of a "very preterm" baby is (Round to four decimal places as needed.)