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.

Year me e

(in 2015 dollars)

1972 $37,760 $43,766 2015 37,138 54,757 Data from: U.S. Census Bureau.

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.