total income from all people in the household
in terms of income, it is the income for which 50% of households have a lower income, and 50% have a higher income
for example, the 80th percentile of household income is the income for which 80% of household have a lower income and 20% have a higher income
a quintile is 20% of a population, grouped by percentile; for example, the 2nd quintile is all members of a population between the 20th and 40th percentiles
a statistical measure of how unevenly income is distributed in a population (ranging from 0% to 100%, the higher the number, the greater the inequality)
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