The height of North American adult men varies according to a distribution that is approximately normal with a mean of 70 inches and a standard deviation of 3.5 inches. Using the 68-95-99.7 Rule, between what two heights will approximately 68% of the heights be centered about the mean?
- 66.5 inches and 73.5 inches
- 63 inches and 77 inches
- 70 inches and 73.5 inches
- 67.6 inches and 72.4 inches