SELECT sum(city_population) FROM district WHERE city_area  >  (SELECT avg(city_area) FROM district)
Find the total population of the districts where the area is bigger than the average city area.
SELECT sum ( city_population ) FROM district WHERE city_area > ( SELECT avg ( city_area ) FROM district )
select sum ( city_population ) from district where city_area > ( select avg ( city_area ) from district )
Find the total population of the districts where the area is bigger than the average city area .