(Answered) The upper arm length of females over 20 years old in the

Statistics

The upper arm length of females over 20 years old in the United States is approximately Normal with mean 35.9 centimeters (cm) and standard deviation 2.2 cm. Use the 68-95-99.7 rule to answer the following questions. NOTE: The numerical values in this problem have been modified for testing purposes.

(a) What range of lengths (± 0.1 cm) covers almost all (99.7%) of this distribution?

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