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According to the Air Transport Association of America, the average operating cost of an MD-80 jet...

According to the Air Transport Association of America, the average operating cost of an MD-80 jet airliner is $2,087 per hour. Suppose the operating costs of an MD-80 jet airliner are normally distributed with a standard deviation of $170 per hour.

(Round the value of z to 2 decimal places. Round your answers to 2 decimal places.)

(a) At what operating cost would only 23% of the operating costs be less?



(b) At what operating cost would 65% of the operating costs be more?



(c) What operating cost would be more than 85% of operating costs?
Math   Statistics-And-Probability   
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