Suppose that the height of North American adult men varies according to a distribution that is approximately normal with a mean of 69.5 inches and a standard deviation of 3.4 inches. Using the 68-95-99.7 Rule, between what two heights willapproximately 68%of the heights be centered about the mean?

a 69.5 inches and 72.9inches

b 62.7 inches and 76.3 inches

c 66.1 inches and 72.9 inches

d 65.1 inches and 73.9 inches