The Department of Transportation (DOT) fields thousands of complaints about airlines each year. The DOT categorizes and tallies complaints, and then periodically publishes rankings of airline performance. The following table presents the 2006 results for the 10 largest U.S. airlines.

a. Which airline fielded the least amount of complaints? Which airline fielded the most? Calculate the range.
b. Calculate the mean and the median number of complaints for this sample.
c. Calculate the variance and the standard deviation.

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Airline Southwest Airlines JetBlue Airways Alaska Airlines Complaints Airline Complaints 8.84 1.82 Northwest Airlines Delta Airlines American Airlines US Airways United Airlines 13 3.98 10.35 5.24 10.87 6.24 8.83 13.59 AirTran Airways Continental 13.60 Airlines