Table schema:
CREATE TABLE table_name_63 (population_density INTEGER, population__2011_ VARCHAR, change___percentage_ VARCHAR, county VARCHAR)

Question: What is the Population density that has a Change (%) higher than 10.4, and a Population (2011) less than 8574, in the County of Queens?
SQL: SELECT AVG(population_density) FROM table_name_63 WHERE change___percentage_ > 10.4 AND county = "queens" AND population__2011_ < 8574