Table 1.15 shows attendance at NFL football games.

(a) Find the average rate of change in the attendance from 2011 to 2015. Give units. 

(b) Find the annual increase in the average attendance for each year from 2011 to 2015. (Your answer should be four numbers.)

(c) Show that the average rate of change found in part (a) is the average of the four yearly changes found in part (b).

Table 1.15 Attendance at NFL football games, in millions of fans

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Year Attendance (millions) 2011 2012 2013 2014 2015 17.12 17.18 17.30 17.36 17.26