This questim': 1 Submit test point(s) possible l6 . Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 71 miles per hour, with a standard deviation of 3 miles per hour. Estimate the percent of vehicles whose speeds are between 68 miles per hour and 74 miles per hour. (Assume the data set has a bell-shaped distribution) M Approximately 11% of vehicles travel between 68 miles per hour and 74 miles per hour