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The level of nitrogen oxides (NOX) in the exhaust of cars of a particular model...

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The level of nitrogen oxides (NOX) in the exhaust of cars of a particular model varies Normally with mean 0.24 grams per mile (g/mi) and standard deviation 0.059 g/ml. Government regulations call for NOX emissions no higher than 0.26 g/ml.What is the probability (0.001) that a single car of this model fails to meet the NOX requirement? A company has 15 cars of this model in its fleet. What is the probability (0.001) that the average NOX level of these cars is above the 0.26 g/mi limit?

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