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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.
Several possible ways have been proposed to define the middle class based on median income: Middle Quintile. One particularly narrow definition limits the middle class to households in the middle quintile for income â that is, those who make more than the poorest 40% of Americans and less than the richest 40%. That definition would put the income range for the middle class between $41,187 and $68,212. Middle Three Quintiles.