Answered: Emissions of nitrogen oxides, which are…

ENGR.ECONOMIC ANALYSIS

14th Edition

ISBN:9780190931919

Author:NEWNAN

Publisher:NEWNAN

Chapter1: Making Economics Decisions

Section: Chapter Questions

Problem 1QTC

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Question

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 (in
parts per billion) by a randomly selected vehicle. Suppose the distribution of x can be
described by a normal distribution with μ = 1.6 and σ = 0.4. A city wants to offer some
sort of incentive to get the worst polluters off the road. What emission levels
constitute the worst 10% of the vehicles?

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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