advertising age annually compiles a list of the 100 companies that spend the most onadvertising. Consumer-goods company Procter & gamble has often topped the list, spending billions of dollars annually (advertising age website, March 12, 2013). Consider thedata found in the file Advertising. it contains annual advertising expenditures for a sample of20 companies in the automotive sector and 20 companies in the department store sector.a. What is the mean advertising spent for each sector?

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