=+f. How well do the statements in Part

(e) based on Chebyshev’s Rule agree with the actual percentages for the travel time distribution? (Hint: You can estimate the actual percentages from the given relative frequency distribution.)

4.39 Mobile homes are tightly constructed for energy conservation. This can lead to a buildup of indoor pollutants.

The paper “A Survey of Nitrogen Dioxide Levels Inside Mobile Homes” (Journal of the Air Pollution Control Association [1988]: 647–651) discussed various aspects of NO2 concentration in these structures.