The Internal Revenue Service (IRS) publishes data on adjusted gross incomes in the document Statistics of Income, Individual Income Tax Returns. The following relative-frequency histogram shows one year's individual income tax returns for adjusted gross incomes of less than $50,000.

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0.40 0.35 6 0.30 0.25 S 0.20 0.15 0.10 0.05 0.00 0 10 20 30 40 50 Adjusted gross income ($1000s)