a. Using the class intervals in the table, construct a histogram in which the heights of the rectangles are equal to the frequencies.
b. Using the class intervals in the table, construct a histogram in which the heights of the rectangles are equal to the densities.
c. Compare the histograms in parts (a) and (b) with the histogram in Figure 1.8, for which the heights are the relative frequencies. Are the shapes of the histograms the same?

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0.30厂 0.20 0.101- 0 1 3 5 7 913 15 17 19 21 23 25 Emissions (g/gal)