In 2017, the entire fleet of light‑duty vehicles sold in the united states by each manufacturer must emit an average of no more than 91 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 91 mg/mi of nox ++ nmog? (enter your answer rounded to four decimal places.)probability - ? (b) a company has 16 cars of this model in its fleet. what is the probability that the average nox ++ nmog level x¯x¯ of these cars is above 92 mg/mi? (enter your answer rounded to four decimal places.)probability - ?