Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 65 miles per hour, with a standard deviation of 5 miles per hour. Estimate the percent of vehicles whose speeds are between 55 miles per hour and 75 miles per hour. (Assume the data set has a bell-shaped distribution.)
Approximately___% of vehicles travel between 55 miles per hour and 75 miles per hour.
