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Data regarding fuel efficiency of an 18-wheel truck were collected. The graph shows the correlation between the average speed above 40 miles per hour (in miles per hour) and the money spent on gas (in dollars):

image of a scatter plot with Average Speed on the x axis and Money Spent on Fuel on the y axis with points 1 comma 2, 3 comma 2 and one half, 5 comma 5, 7 comma 7, 9 comma 10, 11 comma 15, and 12 comma 17

Estimate the average rate of change from x = 5 to x = 9.

4
−4
1.25