Question: Suppose that the distribution of speeds at an interstate highway location is bell-shaped with a mean of 71 mph and a standard deviation of 5 mph. Use the Empirical Rule to complete each sentence:
a. About 68% of vehicles at this location travel between and mph.
b. About 95% of vehicles at this location travel between and mph.
c. About 99.7% of vehicles at this location travel between and mph.