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The upper arm length of males over 20 years old in the United States is approximately...

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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