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The lengths of a particularanimal's pregnancies are approximately normallydistributed, with mean = 259 days and standard deviation = 20 days. (a) What proportion of pregnancies

The lengths of a particularanimal's pregnancies are approximately normallydistributed, with mean =259 days and standard deviation =20 days.

(a) What proportion of pregnancies lasts more than 289 days?

(b) What proportion of pregnancies lasts between 249 and 274 days?

(d) A"very preterm" baby is one whose gestation period is less than 214 days. Are very preterm babiesunusual?

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