A report from Texas Transportation Institute (Texas A& M University System 2005) on congestion reduction strategies included data on extra travel time during rush hour ( in hours per year) for different urban areas. The following data are for urban areas that had a population of over 3 million.

Compute and interpret the values of the quartiles and the interquartile range.

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Extra Hours Per Traveler Per Year 98 75 Urban Area Los Angeles San Francisco Washington, D.C Atlanta Houston Dallas, Fort Worth Chicago Detroit Boston New York Phoenix Miami Philadelphia 64 65 61 54 53 50 49 48