The following table shows Fortune 500's rankings of America's 10 largest corporations for 2010. Next to each corporation is its market capitalization (in billions of dollars as of March 26, 2010) and its total return to investors for the year 2009. These data, labeled Largest Corporations, are also available on the text website. R-96

a. Calculate the mean and the median for market capitalization.

b. Calculate the mean and the median for total return.

c. For each variable (market capitalization and total return), comment on which measure best reflects central location.

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Mkt. Cap. Company Walmart (in $ billions) Total Return $209 -2.7% Exxon Mobil 314 -12.6 Chevron 149 8.1 General Electric 196 -0.4 Bank of America 180 7.3 ConocoPhillips 78 2.9 AT&T 155 4.8 Ford Motor 47 336.7 JP Morgan Chase 188 19.9 Hewlett-Packard 125 43.1