Question: What is the probability a random sample of size 20 will have a mean gestation period within 8 days of themean sample mean is 247

What is the probability a random sample of size 20 will have a mean gestation period within 8 days of themean

sample mean is 247

sample standard deviation is (26/sqrt(20))=4.472136

I also have the z score formula I just do not understand how to solve this problem or where the 8 days comes into the equation

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