1) a) Find Zc when c = .75. In other words, find Z.75. Be sure to draw a quality visual display. ____________

b)The Environmental Protection Agency (EPA) estimates for automobile models tested recently that the fuel economy has a mean of 25.2 miles per gallon, with a standard deviation of 5.8 miles per gallon.

Use your Zc from above to determine the lowest and highest fuel economy for the middlemost 75% of the distribution. Use the z-score formula to do these calculations and then verify with your invnorm function on the calculator. Show work!

Lowest __________

Highest____________