Based on this table showing the Distribution of Household Income for 2018, answer the three questions below

	2018
Quintile	Income Range	Share of Total U.S. Income
Lowest	$0 - $25,600	3.1%
Second	$25,601 - $50,000	8.3%
Third	$50,001 - $79,542	14.1%
Fourth	$79,543 - $130,000	22.6%
Highest Fifth	Above $130,000	52.0%
Richest 5% (not a quintile)	Above $248,728	23.1%

1)What is meant by an income quintile?

2) What share of households had incomes of $50,000 or less in 2018 and explain?

3) What was the share of income received by the lowest three quintiles combined?