The pregnancy durations (in days) for a population of new mothers can be approximated by a normal

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The pregnancy durations (in days) for a population of new mothers can be approximated by a normal distribution, with a mean of 267 days and a standard deviation of 10 days.

(a) What is the minimum pregnancy durations that can be in the top 10% of pregnancy durations?

(b) What pregnancy durations would be considered unusual?

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