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5. Almost all US light-rail systems use electric cars that run on tracks built at street level. The Federal Transit Administration claims light-rail is one

5. Almost all US light-rail systems use electric cars that run on tracks built at street level. The Federal Transit Administration claims light-rail is one of the safest modes of travel, with an accident rate of 0.99 accidents per million passenger miles as compared to 2.29 for buses. The following data show the miles of track and the weekday ridership in thousands of passengers for six light-rail systems (USA Today, January 7, 2003) City Cleveland Denver Portland Sacramento San San St. Diego Jose Louis Miles of 15 17 38 21 47 31 34 Track Ridership 15 35 81 31 75 30 42 (1000s) a. Use the data to develop an estimated equation that could be used to predict the ridership given the miles of track b. What is the mean weekday ridership for all the light-rail systems with 30

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