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Median income is the amount which divides the income distribution into two equal groups, half having income above that amount, and half having income below that amount. Mean income (average) is the amount obtained by dividing the total aggregate income of a group by the number of units in that group.
Updated May 23, 2017. Definition: Middle-class income is between 67 percent and 200 percent of the average median income. That's according to the Pew Research Center. There's no official U.S. government definition of middle-class income, as there is of the federal poverty level. The average median income is exactly in the middle of the range of incomes. Half of Americans make more and the other half make less.