Following are boxplots of the level of fine particle air pollution, in micrograms per cubic meter, in the cities of Denver and Greeley, Colorado, during a recent winter.

a. In which city is the pollution level generally higher?

b. Approximately what percentage of the values for Greeley are greater than the median value for Denver? Is it closest to 25%, 50%, 75%, or 90%?

c. In which city is there more spread in the pollution levels?

d. Are the pollution levels for Greeley skewed right, skewed left, or approximately symmetric?

e. Are the pollution levels for Denver skewed right, skewed left, or approximately symmetric?

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Greeley Denver XX X X X 0 5 10 15 20 25 30