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Assume the resting heart rates for a sample of individuals are normally distributed with a mean...

Assume the resting heart rates for a sample of individuals are normally distributed with a mean of 80 and a standard deviation of 20. Use the​ 68-95-99.7 rule to find the following quantities.

a. The relative frequency of rates less than 120 using the​ 68-95-99.7 rule is what rounded to three decimals?

math   Statistics-And-Probability   
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