The number of days that selected U.S. metropolitan areas failed to meet acceptable air quality standards is shown below for 1998 and 2003. Construct a grouped frequency distribution with 7 classes and a histogram for each set of data, and compare your results.

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1998 2003 43 76 51 14 0 10 10 14 20 15 6 20 0 5 17 67 25 17 0 5 19 127 4 38 0 56 8 0931 5 88 16 14 5 37 14 95 20 14 19 20 9 138 22 23 12 33 0 3 4513 10 20 20 20 12 2