68% of statistics 95% of statistics 99.7% of statistics 4 Mean ▲ Mean 3 st dev 1 st. 1 st. 2 st. dev below 2 st dev above 3 st. dev below above dev dev below above The number of potholes in any given 1-mile stretch of freeway pavement in Pennsylvania has a Normal distribution. This distribution has a mean of 63 potholes, and a standard deviation of 7 potholes. Using the Empirical Rule, what is the approximate percentage of 1-mile long roadways with potholes numbering between 56 potholes and 70 potholes? % 4 Mean

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