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What is the approximate percentage of 1-mile long roadways

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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 42 and a standard deviation of 7. Using the Standard Deviation Rule, aka the Empirical Rule, what is the approximate percentage of 1-mile long roadways with potholes numbering between 21 and 56?

Reference no: EM132847594

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