For Exercises 8 through 25, assume that the sample is taken from a large population and
Chapter 6, Problem 13(choose chapter or problem)
For Exercises 8 through 25, assume that the sample is taken from a large population and the correction factor can be ignored.Fuel Efficiency for U.S. Light Vehicles The average fuel efficiency of U.S. light vehicles (cars, SUVs, minivans, vans, and light trucks) for 2005 was 21 mpg. If the standard deviation of the population was 2.9 and the gas ratings were normally distributed, what is the probability that the mean mpg for a random sample of 25 light vehicles is under 20? Between 20 and 25?
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