the file taxdata contains information from federal tax returns filed in 2007 for all counties in the united states (3,142 counties in total). create an excel table based on these data. using excel table functionality, answer the following questions. click on the datafile logo to reference the data. (a) which county had the largest total adjusted gross income in the state of florida? miami-dade county (b) which county had the largest average adjusted gross income in the state of florida?