Consider the following data on the estimated cost (in millions of dollars) resulting from traffic congestion for different urban areas. The following are the data for the 13 largest U.S. urban areas. Urban Area Total Cost (millions of dollars) New York 15 Los Angeles 13 Chicago 7 Washington, D.C. 5 Houston 5 Dallas, Fort Worth 4 Detroit 4 Miami 4 Phoenix 4 Philadelphia 4 San Francisco 3 Boston Atlanta 3 3 (a) Calculate the mean and standard deviation for this data set (in millions of dollars). (Round your answers to four decimal places.) mean $ million standard deviation $ million

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