4.56 ● The technical report “Ozone Season Emissions by State” (U.S. Environmental Protection Agency, 2002) gave the following nitrous oxide emissions (in thousands of tons) for the 48 states in the continental U.S. states:

76 22 40 7 30 5 6 136 72 33 0 89 136 39 92 40 13 27 1 63 33 60 27 16 63 32 20 2 15 36 19 39 130 40 4 85 38 7 68 151 32 34 0 6 43 89 34 0

a. Use these data to construct a boxplot that shows outliers.

b. Write a few sentences describing the important characteristics of the boxplot.