Emissions of nitrogen oxides, which are major constituents of smog, can be modeled using a normal distribution. Let x denote the amount of this pollutant emitted by a randomly selected vehicle (in parts per billion). Suppose the distribution of x can be described by a normal distribution with
= 1.7
and
= 0.5.
Suppose that the EPA wants to offer some sort of incentive to get the worst polluters off the road.