Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_46 (area__km_2__ INTEGER, population VARCHAR)
### Question:
What is the km2 area for the population of 311?
### Answer:
SELECT AVG(area__km_2__) FROM table_name_46 WHERE population = 311