Emiion of nitrogen oxide, which are major contituent of mog, can be modeled uing a normal ditribution. Let x denote the amount of thi pollutant emitted by a randomly elected vehicle (in part per billion). The ditribution of x can be decribed by a normal ditribution with µ = 1.6 and σ = 0.4. Suppoe that the EPA want to offer ome ort of incentive to get the wort polluter off the road. What emiion level contitute the wort 10% of the vehicle?