Table 21P-1 shows a data set that contains the income of 20 households, each with a household size of four people.
a. What percent of these households are below the national poverty line of $18,250 for a household of four people?
b. What is the average income of the bottom 20 percent of the households?
c. Which poverty measurement (the national one, or the bottom quintile) gives a higher poverty rate?