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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Biology

Hezekiah Warner

20 August, 14:21

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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Zaid Welch · Answer 1

Assume that the mean length of a human pregnancy is 268 days with a standard deviation of 9 days. What precentage of human pregnancies do we expect to last no more than 260 days?

z (260) = (260-268) / 9 = - 8/9

P (x < = 260) = P (z < = - 8/9) = normalcdf (-100,-8/9) = 0.1870