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Six different​ second-year medical students at Bellevue Hospital measured the blood pressure of the same person....

Six different​ second-year medical students at Bellevue Hospital measured the blood pressure of the same person. The systolic readings​ (in mmHg) are listed below. Find the​ range, variance, and standard deviation for the given sample data. If the​ subject's blood pressure remains constant and the medical students correctly apply the same measurement​ technique, what should be the value of the standard​ deviation?
146 137 120 138 138 137   

Math   Statistics-And-Probability   
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