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Social & Preventive Medicine Biostatistics 72bc6771

Systolic BP of a group of 200 people follows normal distribution. Mean BP is 120 mm Hg and standard detion 10. Which of the following is true-

A

68% of people have BP between 110-130 mm Hg

B

95% of people have BP between 110-130 mm Hg

C

68% of people have BP between 100-140 mm Hg

D

99% of people have BP between 100-140 mm Hg

High-Yield Explanation

Ref:Parks 23rd edition pg 849. 1SD : confidence limit = 68% 2SD : confidence limit = 95% 3SD : confidence limit = 99.7% 68% have BP : 110 - 130 95% have BP : 100 - 140 99.7% have BP : 90 - 150

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