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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.

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