The speeds (in miles per hour) of motorists ticketed during one day on a five-mile stretch of highway are listed below.

80, 70, 89, 85, 85, 75, 72, 73, 80, 83, 86, 88, 88, 70, 89, 74, 75, 84, 73, 71

The mean speed is 79.5 mph with a standard deviation of 6.8 m.

If the police decide to only ticket people going 3 standard deviations or more above the standard deviation, what would the range be?

Your