Question: Please help I have no idea how to do these? The lengths of a particular animal's pregnancies are approximately normally distributed , with mean u

Please help I have no idea how to do these?

The lengths of a particular animal's pregnancies are approximately normally distributed , with mean u = 252 days and standard deviation o = 12 days.

(1) What proportion of pregnancies last more than 261 days?

(2) What proportion of pregnancies last between 237 and 255 days?

(3) What is the probability that randomly selected pregnancy last no more than 243 days?

(4) A "very preterm" baby is one whose gestation period is less than 222 days. Are very preterm babies unusual?

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