Refer to Table 1.6.

a. What is the average miles per gallon for city driving?
b. On average, how much higher is the miles per gallon for highway driving as compared to city driving?
c. What percentage of the cars have four-cylinder engines?
d. What percentage of the cars use regular fuel?

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Highway MPG Size Cylinders 12 BMW 328Xi Cadillac CTS i Elantra Jeep Grand Cherokee Midsize Volkswagen Jetta