Empirical rule is 68-95-99.7, which means approximately 68% is between 1 standard deviation about the mean, approximately 95% is between 2 standard deviations about the mean, and approximately 99.7% is 3 standard deviations about the mean.
124.4 is two standard deviations below the mean and 125.6 is two standard deviations above the mean. (Remember 1 standard deviation is equal to 0.3 volts.)
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the authors's generac generator produces voltage amounts with a mean of 125.0 volts and a standard deviation of 0.3 volts, and the voltages have a bell-shaped distribution. using the empiral rule, what is the percentage of voltage amounts between 124.4 and 125.6 volts?
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