the upper arm length of males over 20 years old in the united statesis approximately normal with mean 39.1 centimeters and standard deviation 2.3cm.use the 68-95-99.7 rule to answer the following queestions  a-what range of lengths covers the middle 99.7 of the distribution? b-what percent of the men over 20 have upper arm lengths greater than 41.4cm?

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the upper arm length of males over 20 years old in the united statesis approximately normal with mean 39.1 centimeters and standard deviation 2.3cm.use the 68-95-99.7 rule to answer the following queestions 

a-what range of lengths covers the middle 99.7 of the distribution?

b-what percent of the men over 20 have upper arm lengths greater than 41.4cm?

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