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

Use the histogram and the fact that adjusted gross incomes are expressed to the nearest whole dollar to answer each of the following questions.

1. Approximately what percentage of the individual income tax returns had an adjusted gross income between $10,000$ and $19,999, inclusive?
2. Approximately what percentage had an adjusted gross income of less than $30,000?
3. The IRS reported that 89,928,000 individual income tax returns had an adjusted gross income of less than $50,000. Approximately how many had an adjusted gross income between $30,000 and $49,999, inclusive?

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