Share
Explore BrainMass

Vehicle Mileage Statistical Analysis

The Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested recently predicted a mean = 24.8 miles per gallon and a standard deviation a = 6.2 miles per gallon for highway driving. Assume a normal distribution.

Use this information to answer questions #13 - #14.

(13) Use Table 4 (Standard Normal probability table), software, or the TI-83 to find the probability that a randomly selected automobile gets between 31 mpg and 37 mpg.

14) Find the gas mileage of the worst 2.5% of all cars. Transform a z-score into an x-value.

Solution Preview

Please see the attachments.
Calculations are in excel.

The Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested recently predicted a mean = 24.8 miles per gallon and a standard deviation a = 6.2 miles per gallon for highway driving. Assume a normal distribution.
Use this information to answer questions #13 - #14.
(13) Use Table 4 ...

Solution Summary

The solution to questions proposed, complete with calculations/formula. Standard normal probability tables are provided.

$2.19