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Example: Using the Empirical Rule The resting heart rates for a sample of 150 individuals are normally distributed with a mean of 70 and a standard deviation of 15. Use the 68-95-99.7 rule to find the heart rates in each of the following cases : 1. less than 55 2. less than 40 3. Between 70 and 100 4. greater than 85 5. between 40 and 55 6. greater than 115 7 . Between what two values do 99.7 percent of the data lie? 8. Between what two values do 68 percent of the data lie