An coordinate plane is shown. The vertical y-axis is numbered from 0 to 10 and the horizontal x-axis is also numbered from 0 to 10. A curve is graphed that passes through the points 0, 2 and 5, 3 and 8, 6 and 9, 8.. A function is shown in the graph. What is the average rate of change of the function from x = 5 to x = 9?