The U.S. Department of Agriculture reports in Food Consumption Prices, and Expenditures that the average American consumed about 33.5 lb of cheese in 2011. Cheese consumption has increased steadily since 1960, when the average American ate only 8.3 lb of cheese annually. The following table provides last year's cheese consumption, in pounds, for 35 randomly selected Americans. Use limit grouping with a first class of 20-22 and a class width of 3.

a. Determine a frequency distribution.
b. Obtain a relative-frequency distribution.
c. Construct a frequency histogram based on your result from part (a).
d. Construct a relative-frequency histogram based on your result from part (b).

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45 28 32 37 41 39 33 32 31 35 27 46 25 41 35 31 44 23 38 27 32 43 32 25 36 26 30 35 36 36 35 21 43 35 28