The U.S. Energy Information Administration collects data on residential energy consumption and expenditures. Results are published in the document Residential Energy Consumption Survey: Consumption and Expenditures. The following table gives one year’s energy consumption for a sample of 50 households in the South. Data are in millions of BTUs. Use limit grouping with a first class of 40–49 and a class width of 10.
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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