Question

If a variable has a distribution that is​ bell-shaped with mean 19 and standard deviation 7​, then according to the Empirical​ Rule, 68.0​% of the data will lie between which​ values?

Answer 1

The empirical rule says that approximately 68% of a normal distribution falls within one standard deviation of the mean. In this case, this would include all values of the variable in the interval $(19-7,19+7)=(12,26)$.