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OpenStudy (anonymous):
Assume that the mean length of a human pregnancy is 268 days with a standard deviation of 9 days. What percentage of human pregnancies do we expect to last no more than 260 days?
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OpenStudy (anonymous):
\[z=(xbar-\mu)/\sigma\]z=(260-268)/9 z=-0.88888 Use normal distribution tables to find the corresponding percentage: P(X<260) =1- P(Z>-0.8888) P(X<260)=0.187
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