The lengths of a particular animal's pregnancies are approximately normally distributed, with mean u=261 days and standa

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The Lengths Of A Particular Animal S Pregnancies Are Approximately Normally Distributed With Mean U 261 Days And Standa 1 (29.12 KiB) Viewed 32 times

The lengths of a particular animal's pregnancies are approximately normally distributed, with mean u=261 days and standard deviation a=20 days. (a) What proportion of pregnancies lasts more than 266 days? (b) What proportion of pregnancies lasts between 231 and 271 days? (c) What is the probability that a randomly selected pregnancy lasts no more than 241 days? (d) A "very preterm" baby is one whose gestation period is less than 216 days. Are very preterm babies unusual? (a) The proportion of pregnancies that last more than 266 days is (Round to four decimal places as needed.) (b) The proportion of pregnancies that last between 231 and 271 days is (Round to four decimal places as needed.) (c) The probability that a randomly selected pregnancy lasts no more than 241 days is (Round to four decimal places as needed.) (d) The probability of a "very preterm baby is. This event (Round to four decimal places as needed.) m unusual because the probability is than 0.05