Chapter 5, Problem 9E

a.

To determine

Draw the model for auto fuel economy. Clearly label it, showing what the 68-95-99.7 Rule predicts.

b.

To determine

Find the interval in which the central 68% of autos to be found.

c.

To determine

About what percent of autos should get more than 31 mpg.

d.

To determine

Find about what percent of cars should get between 31 and 37.2 mpg.

e.

To determine

Describe the gas mileage of the worst 2.5% of all cars.