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 86 mg/mi and standard deviation 5 mg/mi. What is the probability that a single car of this model emits less than 91 mg/mi of NOX + NMOG? (Enter your answer rounded to four decimal places.)