With the ups and downs in the economy since 2008, many discount airline fares are available if a customer knows how to obtain the discount. Many travelers complain that they get a different price every time they call. The American Consumer Institute recently priced tickets between Spokane, Washington, and St. Louis, Missouri. The passenger was to fly coach class round-trip, staying seven days. Calls were made directly to airlines and to travel agents with the following results. Note that the data reflect round-trip airfare.

a. Compute the mean quoted airfare.
b. Compute the variance and standard deviation in airfares quoted. Treat the data as a sample.