Question

15.32 Pollutants in auto exhausts. Light vehicles sold in the United States must emit an average of no more than 0.05 grams per mile (g/mi) of nitrogen oxides (NOX) after 50,000 or fewer miles of driving. NOX emissions after 50,000 or fewer miles of driving for one car model vary Normally with mean 0.03 g/mi and standard deviation 0.01 g/mi. (a) What is the probability that a single car of this model emits more than 0.05 g/mi of NOX? (b) A company has 25 cars of this model in its fleet. What is the probability that the average NOX lev- el of these cars is above 0.05 g/mi?

Answer 1

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