The empirical rule states that approximately 68% of the distribution falls within one standard deviation of the mean, 95% within two standard deviations, and 99.7% between three standard deviations.
This means:
68% of men will have a height in the range [tex](171-7,171+7)=(164,178)[/tex]
95% of men will have a height in the range [tex](171-14,171+14)=(157,185)[/tex]
99.7% of men will have a height in the range [tex](171-21,171+21)=(150,192)[/tex]
