CREATE TABLE table_62662 ("County" TEXT, "Per capita income" TEXT, "Median household income" TEXT, "Median family income" TEXT, "Population" FLOAT, "Number of households" FLOAT)

Which Number of households has Per capita income of $21,571, and a Population smaller than 9,783?
SELECT AVG("Number of households") FROM table_62662 WHERE "Per capita income" = '$21,571' AND "Population" < '9,783'
SELECT AVG("Number of households") FROM "table_62662" WHERE "Per capita income" = '$21,571' AND "Population" < '9,783'