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Statistics - z-score

Length of Pregnancy. A woman wrote to Dear Abby and claimed that she gave birth 308 days after a visit from her husband, who was in the Navy. Kengths of pregnancies have a mean of 268 days and a standard deviation of 15 days, Find the z score for 308 days. Is such a length unusual? What do you conclude?

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(a) M = 268, SD = 15, x = 308

z = (x - M)/SD

z = (308 - 268)/15 = 2.667

The ...

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