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

The upper arm length of females over 20 years old in the United States is approximately Normal with mean 35.8 cm and standard deviation 2.1 cm. According to the 68-95-99.7 Rule, what percent of women over 20 have upper arm length between 33.7 cm and 35.8 cm?

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