Fuel efficiency In an earlier example, we examined data on highway gas mileages of model year 2012 midsize cars. The following dotplot shows the difference

(highway – city) in EPA mileage ratings for each of the 24 car models from the earlier example.

-2 0 2 4 6 8 10 12 Difference (highway – city)

(a) Explain what the dot above 12 represents.

(b) What does the graph tell us about fuel economy in the city versus on the highway for these car models? Be specific.