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In its Fuel Economy Guide for 2016 model vehicles, the Environmental Protection Agency gives data on...

In its Fuel Economy Guide for 2016 model vehicles, the Environmental Protection Agency gives data on 1170 vehicles. There are a number of high outliers, mainly hybrid gas-electric vehicles. If we ignore the vehicles identified as outliers, however, the combined city and highway gas mileage of the other 1146 vehicles is approximately Normal with mean 23.0 miles per gallon and standard deviation 4.9 mpg.

The quintiles of any distribution are the values with cumulative proportions 0.20, 0.40, 0.60, and 0.80. What are the quintiles of the distribution of gas mileage?

Please explain each step, Thanks!!

There is no other data, this is exactly as stated in the book

Math   Statistics-And-Probability   
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