The Level of Nitrogen Oxides (NO_x) in the Exhaust of Cars

Multiple Choice

The level of nitrogen oxides (NO_x) in the exhaust of cars of a particular model varies Normally, with mean 0.25 gram per mile (g/mi) and standard deviation 0.05 g/mi. Government regulations call for NO_x emissions no greater than 0.3 g/mi. What is the probability that the NO_x emissions from a single car of this model fails to meet the NO_x government regulations?

A) 0.3173
B) 0.2525
C) 0.1587
D) 0.0228