Miles Per Gallon In Its Fuel Economy Guide For 2008 Model Vehicles The Environmental Protection Agency Gives Data On 1 1 (57.39 KiB) Viewed 41 times
Miles Per Gallon In Its Fuel Economy Guide For 2008 Model Vehicles The Environmental Protection Agency Gives Data On 1 2 (7.9 KiB) Viewed 41 times
Miles per gallon. In its Fuel Economy Guide for 2008 model vehicles, the Environmental Protection Agency gives data on 1152 vehicles. There are a number of outliers, mainly vehicles with very poor gas mileage. If we ignore the outliers, however, the combined city and highway gas mileage of the ocher 11 20 or so vehicles is approximately Normal with mean 18.7 miles per gallon (mpg) and standard deviation 4.3 mpg. Exercises 3.35 to 3.38 concern this distribution. Meta 3.35 In my Chevrolet. The 2008 Chevrolet Malibu with a four-cylinder engine has com- bined gas mileage 25 mpg. What percent of all vehicles have worse gas mileage than the Malibu? 3.36 The top 10%. How high must a 2008 vehicle's gas mileage be in order to fall in the top 10% of all vehicles? (The distribution omits a few high outliers, mainly hybrid gas-electric vehicles.) 3.37 The middle half. The quartiles of any distribution are the values with cumulative proportions 0.25 and 0.75. They span the middle half of the distribution. What are the quartiles of the distribution of gas mileage?
3.38 Quintiles. The quintiles of any distribution are the values with cumulative propor- tions 0.20, 0.40, 0.60, and 0.80. What are the quintiles of the distribution of gas mileage?
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