Here are data for 15 subway systems in the United States and Puerto Rico Heavy Urban Rapid Rail Systems in the U.S. System Length (Miles) Index Number of Stations Index NYC Subway 245.0   472   Washington Metro 117.0   91   Chicago "L" 102.8   146   Massachusetts Bay Transportation Authority 38.0   53   Bay Area Rapid Transit 112.0   46   Southeastern PA Transity Authority 36.7   75   Path 13.8   13   MARTA Rail Transit 47.6   38   Metro Rail (Los Angeles) 17.4   16   Metro Rail (Los Angeles) 24.4   23   PATCO (Philadelphia, So. New Jersey) 14.2   133   Baltimore Metro Subway 15.5   14   Staten Island Railway 14.0   22   RTA Rapid Transit (Cleveland) 19.0   18   Tren Urbano (San Juan) 10.7   16   Average 55.2   78.4   Calculate index numbers for each subway system for: The length of the system in miles (Use the arithmetic mean as your base) The number of subway stations (Use the arithmetic mean as your base) c. Comment of your findings

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