# Question: The Environmental Protection Agency EPA fuel economy estimates for automobiles

The Environmental Protection Agency (EPA) fuel economy estimates for automobiles suggest a mean of 24.8 mpg and a standard deviation of 6.2 mpg for highway driving. Assume that a Normal model can be applied.

a) Draw the model for auto fuel economy. Clearly label it, showing what the 68-95-99.7 Rule predicts about miles per gallon.

b) In what interval would you expect the central 68% of autos to be found?

c) About what percent of autos should get more than 31 mpg?

d) About what percent of cars should get between 31 and 37.2 mpg?

e) Describe the gas mileage of the worst 2.5% of all cars.

a) Draw the model for auto fuel economy. Clearly label it, showing what the 68-95-99.7 Rule predicts about miles per gallon.

b) In what interval would you expect the central 68% of autos to be found?

c) About what percent of autos should get more than 31 mpg?

d) About what percent of cars should get between 31 and 37.2 mpg?

e) Describe the gas mileage of the worst 2.5% of all cars.

## Answer to relevant Questions

Some IQ tests are standardized to a Normal model with a mean of 100 and a standard deviation of 16. a) Draw the model for these IQ scores. Clearly label it, showing what the 68-95-99.7 Rule predicts about the scores. b) In ...In a standard Normal model, what value(s) of 2 cut(s) off the region described? Remember to draw a picture first. a) The lowest 12 % b) The highest 30% c) The highest 7% d) The middle 50% The first Statistics exam had a mean of 65 and a stan¬dard deviation of 10 points; the second had a mean of 80 and a standard deviation of 5 points. Derrick scored an 80 on both tests. Julie scored a 70 on the first test ...Indicate whether each statement below is true or false. If false, explain why. a) Asking viewers to call into an 800 number is a good way to produce a representative sample. b) When writing a survey, it’s a good idea to ...The Gallup Poll interviewed 1022 randomly selected U.S. adults aged 18 and older, March 7-10, 2013. Gallup reports that when asked whether respondents thought that global warming was due primarily to human activities, 57% ...Post your question