If the distribution of the height of American men is approximately normal, with a mean of 69 inches and a standard deviation of 2.5 inches, then roughly 68 percent of American men have heights between __________ and __________.
A. 64 inches and 74 inches
B. 66.5 inches and 69 inches
C. 71.5 inches and 76.5 inches
D. 66.5 inches and 71.5 inches
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