In its Fuel Economy Guide for 2016 model vehicles, theEnvironmental Protection Agency provides data on 11701170 vehicles.There are a number of high outliers, mainly hybrid gas?electricvehicles. If we ignore the vehicles identified as outliers,however, the combined city and highway gas mileage of the other11461146 vehicles is approximately Normal with mean 23.023.0 milesper gallon (mpg) and standard deviation 4.94.9 mpg.
The quartiles of any distribution are the values with cumulativeproportions 0.250.25 and 0.75.0.75. They span the middle half ofthe distribution.
What is the first quartile of the distribution of gas mileage?Use Table A and give your answer rounded to two decimal places.
?1=Q1=
mpg
What is the third quartile of the distribution of gas mileage?Use Table A and give your answer rounded to two decimal places.
?3=
