Sunday

December 21, 2014

December 21, 2014

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

-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.

- AP Statistics -
**Reiny**, Friday, November 9, 2007 at 11:30pmI don't have a normal curve or a chart handy, so I will trust that your value of -.84 for .2 is correct.

What that means is that 20% lies from the point .84 of a standard deviation to the left of the mean.

.84(6)=5.04

so 20% of the cars will have a fuel efficiency of below 18.96 mpg

**Answer this Question**

**Related Questions**

precaculus - 1. Gas Mileage Problem The EPA efficiency rating Ina particular ...

Precalculus - 1. Gas Mileage Problem The EPA efficiency rating Ina particular ...

Precalculus - 1. Gas Mileage Problem The EPA efficiency rating Ina particular ...

statistics - The manufacturer of a new compact car claims the miles per gallon (...

Statistics - The manufacturer of a new compact car claims the miles per gallon (...

statistics - . An automobile is selling a new model car with an advertised in&#...

statistics - Ala rge fleet of cars is maintained with an average of 26 mpg. 50 ...

stats - A company with a large fleet of cars hopes to keep gasoline costs down ...

statistics - Miles per gallon. In its Fuel Economy Guide for 2008 model vehicles...

Stat Help Please - A linear model can be used to describe the relationship ...