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Fuel economy estimates for automobiles built one year predicted a mean of 27.2 mpg and a standard deviation of 6.8 mpg for highway driving. Assume
Fuel economy estimates for automobiles built one year predicted a mean of 27.2 mpg and a standard deviation of 6.8 mpg for highway driving. Assume that a Normal model can be applied. Use the 68 -95 -99.7 Rule to complete parts a) through e). a) Draw the model for auto fuel economy. O A. OB. O C. 68% 68%% 95% 95% 99 72% 99 75% 20.4 238 27.2 30.6 34 6.8 136 20.4 27.2 34 40.8 47.6 6.8 13.6 20.4 27.2 40.8 54.4 b) In what interval would you expect the central 99.7% of autos to be found? Using the 68-95-99.7 rule, the central 99.7% of autos can be expected to be found in the interval from 13.6 to 40.8 mpg. (Do not round. Type integers or decimals.) c) About what percent of autos should get more than 34 mpg? Using the 68-95-99.7 rule, about 16 % of autos should get more than 34 mpg. (Do not round. Type an integer or a decimal.) d) About what percent of autos should get between 34 and 40.8 mpg? Using the 68-95-99.7 rule, about 13.5 % of autos should get between 34 and 40.8 mpg. (Do not round. Type an integer or a decimal.) e) Describe the gas mileage of the best 2.5% of cars. Choose the correct answer below. O A. They get more than 34 mpg. O B. They get more than 40.8 mpg. O C. They get less than 20.4 mpg
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