(Answered) The Herfindahl-Hirschman Index for the U.S. airline industry (using the 10 firms given) is blank),…

The Herfindahl-Hirschman Index for the U.S. airline industry (using the 10 firms given) is blank, which is less than 1,500 and therefore considered competitive.
1,221.71
1,207.93
1,218.82