Asked Nov 26, 2019

The mean pregnancy length of new mothers in a population is 267 days with a standard deviation of 10 days. Out of 250 randomly selected new mothers, about how many would you expect to have had a pregnancy greater than 287 days? Use the Standard Normal Distribution.


Expert Answer

Step 1

The pregnancy length of new mothers is normally distributed with mean 267 days and standard deviation 10 days.

The z score for the value 287 is 2 which can be calculated as follows:


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z-score 287-267 10 2

Step 2

The probability that a randomly selected new mother had a pregnancy greater than 287 days can be obta...


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1-NORM.DIST(2,0,1,TRUE) E F 0.022750132 LL


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