The fuel efficiency of cars currently registered in Indiana is 24 miles per gallon with a standard deviation of 5.5 mpg. 9. What is the fuel efficiency of the worst 20% of cars?

10. What would be the fuel efficiency of the best 5% of cars?

A water fountain is designed to dispense a volume of 12.2 oz with a standard deviation of 0.5 oz.

11. What percent of cups end up with at least 12 oz?

12. 75% of the cups contain more than how much water?

A tire manufacturer believes that the tread life of its snow tires has a mean of 32,000 miles and a standard deviation of 2500 miles. 13. If you buy a set of these tires, would it be reasonable for you to hope they'll last more than 40,000 miles? (You can be reasonable at a 95% level). Explain

14. In planning a marketing strategy, a local tire dealer wants to offer a refund to any customer whose tires fail to last a certain number of miles. However, the dealer does not want to take too big of a risk. If the dealer is willing to give refunds to only 1 out of every 25 customers, for what mileage can he guarantee these tires to last?