In a normally distributed population of adult heights with mean 170 cm and standard deviation 10 cm, approximately what percentage of individuals have heights between 150 cm and 190 cm?

• A 68%
• B 81.5%
• C 99.7%
• D 95% ✓

Explanation

The range 150 to 190 cm spans mean plus or minus 2 SD (170 +/- 20). By the empirical rule for normal distributions, approximately 95% of observations lie within 2 standard deviations of the mean. The 68% range would be 160-180 cm, and 99.7% would be 140-200 cm.

Reference: Park's Textbook of Preventive and Social Medicine, 26th ed.

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