The accompanying table presents data from the U.S. Census Bureau on median and mean income of male workers for the years 1972 and 2015. The income figures are adjusted to eliminate the effect of inflation.

a. By what percentage has median income changed over this period? By what percentage has mean income changed over this period?

b. Between 1972 and 2015, has the income distribution become less or more unequal? Explain.

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Median income Mean income Year (in 2015 dollars) $37,760 1972 $43,766 54,757 2015 37,138