Chapter 1, Problem 3SE

Refer to Table 1.6.

1. a. What is the average miles per gallon for city driving?
2. b. On average, how much higher is the miles per gallon for highway driving as compared to city driving?

TABLE 1.6    FUEL ECONOMY INFORMATION FOR 10 AUTOMOBILES

Car	Size	Cylinders	City MPG	Highway MPG	Fuel
Audi A8	Large	12	13	19	Premium
BMW 328Xi	Compact	6	17	25	Premium
Cadillac CTS	Midsize	6	16	25	Regular
Chrysler 300	Large	8	13	18	Premium
Ford Focus	Compact	4	24	33	Regular
Hyundai Elantra	Midsize	4	25	33	Regular
Jeep Grand Cherokee	Midsize	6	17	26	Diesel
Pontiac G6	Compact	6	15	22	Regular
Toyota Camry	Midsize	4	21	31	Regular
Volkswagen Jetta	Compact	5	21	29	Regular

1. c. What percentage of the cars have four-cylinder engines?
2. d. What percentage of the cars use regular fuel?