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OpenStudy (anonymous):
The lengths of pregnancies are normally distributed with a mean of 273 days and a standard deviation of 30 days. If 144 women are randomly selected, find the probability that they have a mean pregnancy between 273 days and 275 days.
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OpenStudy (anonymous):
Mark: X = "lenght of pregnancy in days" \[P(273\le X \le275)\approx0.2881%\]
OpenStudy (anonymous):
Mark: X = "lenght of pregnancy in days" \[P(273\le X \le275)\approx0.2881%\]
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