Consider the graph of f shown in the figure below. Link for the graph: https://imgur.com/D4hjWNE

(Image: A graph of a curve with local maximums at (1,5), and (5,7) and local minimums at (3,1), and (7,3). The graph has the y-intercept (0,2) and passes through the points (2,3), (4,3.5), and (6,5).)

Estimate the average rate of change from x=4 to x=5.

Enter your estimate as a decimal number (not as a fraction), rounded to one decimal place.

Average rate of change =