SOLUTION: In humans, the average length of a pregnancy is 266 days. Suppose that the distribution of pregnancy lengths can be modeled by a Normal Distribution with standard deviation of 10 d

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Question 1103775: In humans, the average length of a pregnancy is 266 days. Suppose that the distribution of pregnancy lengths can be modeled by a Normal Distribution with standard deviation of 10 days. About what percentage of mothers will deliver their baby within 1 week of their due date?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
z=(x-mean)/sd
want a probability for z between -0.7 and +0.7. This is 0.5161.