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The lengths of a particularanimal's pregnancies are approximately normally distributed, with mean =254 days and standard deviation = 16 days. (a) What proportion of pregnancies

The lengths of a particularanimal's pregnancies are approximately normally distributed, with mean =254 days and standard deviation = 16 days.

(a) What proportion of pregnancies lasts more than 262days?

(b) What proportion of pregnancies lasts between 246 and 266days?

(d) A"very preterm" baby is one whose gestation period is less than 218 days. Are very preterm babiesunusual?

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