Question 1075262
Based on data from the National Health Service, women between the ages of 18 and 24 have an average systolic blood pressure (in mm Hg) of 114.8 with a standard deviation of 13.1. Systolic blood pressure for women between the ages of 18 to 24 follow a normal distribution. 


If 40 women from this population are selected, find the probability that their mean systolic blood pressure is greater than 120.
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z(120) = (120-114.8)/[13.1/sqrt(40)] = 2.51
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Ans: P(x-bar > 120) = P(z > 2.51) = normalcdf(2.51,100) = 0.0060
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Cheers,
Stan H.
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