The heights of a certain group of adult males was found to be normally distributed. The mean height is 170 cm with a standard deviation of 6 cm. In a group of 1200 of these males, about how many would be more than 164 cm tall?

A height of 164 cm is one standard deviation below the mean: (164 − 170) ÷ 6 = −1. About 84.1% of a normal distribution is above one standard deviation below its mean, so 0.841 × 1200 ≈ 1010 males; the correct choice is 1010.

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