CREATE TABLE table_name_38 (area__km_2__ NUMBER, name VARCHAR2, population__2011_ VARCHAR2)

For Stellenbosch, which has a population larger than 155,733, what is the average area?
SELECT AVG(area__km_2__) FROM table_name_38 WHERE name = "stellenbosch" AND population__2011_ > 155 OFFSET 733
SELECT AVG("area__km_2__") FROM "table_name_38" WHERE "name" = "stellenbosch" AND "population__2011_" > 155 OFFSET 733 ROWS