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 3 miles per hour. Estimate the percent of vehicles whose speeds are between 62 miles per hour and 68 miles per hour. (Assume the data set has a bell-shaped distribution.) .... Approximately % of vehicles travel between 62 miles per hour and 68 miles per hour.

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