5 33 Pollutants in auto exhausts continued The level of nitrogen oxides NOX and nonmethane...

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5 33 Pollutants in auto exhausts continued The level of nitrogen oxides NOX and nonmethane organ ic gas NMOG in the exhaust over the useful life 150 000 miles of driving of cars of a particular model varies Normally with mean 80 mg mi and standard deviation 4 mg mi A company has 25 cars of this mod el in its fleet What is the level L such that the prob ability that the average NOX NMOG level x for the fleet is greater than L is only 0 01 Hint This requires a backward Normal calculation See page 91 in Chapter if you need to review

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