# If the price of gasoline follows a normal distribution, has a mean of $2.30 per gallon, and a standard deviation of$0.10 per gallon. What percentage of gasoline is sold between $2.20 and$2.40 per gallon?

The range $2.20 to$2.40 is exactly $\pm 1$ standard deviations from the mean.
According to the Empirical Rule, 68% of gasoline will be sold $\pm 1$ standard deviations from the mean of \$ 2.30 per gallon