In 2017, the entire eet of light-duty vehicles sold in the United States by each manufacturer must emit an average of no more than 92 milligrams per mile (mg/mi) of nitrogen oxides (NOX) and nonmethane organic gas (NMOG) over the useful life ( 150,000 miles of driving) of the vehicle. NOX + NMOG emissions over the useful life for one car model vary Normally with mean 88 mg/mi and standard deviation 4 mg/mi. (a) What is the probability that a single car of this model emits more than 92 mg/mi of NOX + NMOG? (Enter your answer rounded to four decimal places.) (b) A company has 16 cars of this model in its eet. What is the probability that the average NOX + NMOG level 5: of these cars is above 92 mg/mi? (Enter your answer rounded to four decimal places.) Question Source: Moore, The Basic Practice Of Statistics, Be | Publisher: W.H. Freeman