Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 70 miles per hour, with a standard deviation of 4 miles per hour. Estimate the percent of vehicles whose...

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Extracted text: Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 70 miles per hour, with a standard deviation of 4 miles per hour. Estimate the percent of vehicles whose speeds are between 58 miles per hour and 82 miles per hour. (Assume the data set has a bell-shaped distribution.) Approximately 99.7 % of vehicles travel between 58 miles per hour and 82 miles per hour.