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The lengths of a particular​ animal's pregnancies are approximately normally​ distributed, with mean μ=262 days and...

The lengths of a particular​ animal's pregnancies are approximately normally​ distributed, with mean μ=262 days and standard deviation σ=16 days.

​(a) What proportion of pregnancies lasts more than 282 days?

​(b) What proportion of pregnancies lasts between234 and 266 days?

​(c) What is the probability that a randomly selected pregnancy lasts no more than 246 ​days?

​(d) A​ "very preterm" baby is one whose gestation period is less than 238 days. Are very preterm babies​ unusual?

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