The pregnancy length 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 length that can be in the top9​%of pregnancy​ lengths? ​(b) What is the maximum pregnancy length that can be in the bottom7​%of pregnancy​ lengths?

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The pregnancy length 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 length that can be in the top9​%of pregnancy​ lengths?
​(b) What is the maximum pregnancy length that can be in the bottom7​%of pregnancy​ lengths?
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