The quarterly average yield for the airlines industry is computed as

Domestic U.S. flight’s average trip miles per passenger per quarter is approximately 2900 for 2009, 3300 miles for 2014. The following table provides the average quarterly trip fares for 2009, the year following the housing market downturn, and 2014:

(a) Compute the yield for each quarter.

(b) What do the results in (a) say about the trend in the economic health of the industry in 2014 compared to 2009?

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y = Average trip fare ($) per passenger Passenger average trip miles