Posted by **Courtney** on Friday, November 9, 2007 at 10:05pm.

Suppose a Normal model describes the fuel efficiency of cars currently registered on your state. The mean is 24 mpg, with a standard deviation of 6 mpg.

-Describe the fuel efficiency of the worst 20% of all cars.

I know that you convert 20% into decimal form to get .2 and put that number in for Invnorm to get -.84, but how do I get the fuel efficiency of the worst 20% of cars from there.

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