The Superfund Act was passed by Congress to encourage state participation in the implementation of a law relating to the release and cleanup of hazardous substances. Hazardous waste sites financed by the Superfund Act are called Superfund sites. A total of 393 Superfund sites are operated by waste management companies in Arkansas (Tabor and Stan wick, Arkansas Business and Economic Review, Summer 1995). The numbers of these Superfund sites in each of Arkansas's 75 counties are shown in the next table.

a. Find the 10th percentile of the data set. Interpret the result.
b. Find the 95th percentile of the data set. Interpret the result.
c. Find the mean and standard deviation of the data; then use these values to calculate the z- score for an Arkansas county with 48 Superfund sites.
d. Based on your answer to part c, would you classify 48 as an extreme number of Superfund sites?

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