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Statistics 68-95-99.7 Rule Assignment 1 Please use the 68-95-99.7 Rule accompanied by density curves in order to answer the following questions. Approximately what is uit Star 1.62 How big are soldiers' heads? The army reports that the distribution of head circumference among male soldiers is approximately normal with mean 22.8 inches and standard deviation 1.1 inches. Use the 68-95-99.7 rule to answer the following questions. (a) What percent of soldiers have head circumference greater than 23.9 inches? (b) What percent of soldiers have head circumference between 21.7 inches and 23.9 inches? 1.63 Length of pregnancies. The length of human pregnancies from conception to birth varies according to a distribution that is approximately normal with mean 266 days and standard deviation 16 days. Use the 68-95-99.7 rule to answer the following questions. (a) Between what values do the lengths of the middle 95% of all pregnancies fall? (b) How short are the shortest 2.5% of all pregnancies