The upper arm length of males over 20 years old in the United States is approximately Normal with mean 39.1 cm and standard deviation 2.3 cm. Use the 68-95-99.7 rule to answer the following questions.
(a) What range of lengths covers the middle 99.7% of this distribution?
(b) What percent of men over 20 have upper arm lengths greater than 41.4 cm?
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