Six different second-year medical students at Bellevue Hospital measured the blo

Question

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?

121 144 122 145 133 127

Range= ___ mmHg

Sample variance= ______ mmHg^2(Round to the nearest tenth as needed.)

Sample standard deviation= ____ mmHg (Round to the nearest tenth as needed.)

Explanation / Answer

Range = (maximum value - minimu value) = 145 - 121 = 24

Mean = (121 + 144 + 122 + 145 + 133 + 127) / 6 = 132

Sample variance = [(121 - 132)2 + (144 - 132)2 + (122 - 132)2 + (145 - 132)2 + (133 - 132)2 + (127 - 132)2 ] / [6 - 1]

= 112

Sample standard deviation = sqrt(112) = 10.6

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