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_80 (area__km_2__ INTEGER, code VARCHAR, population VARCHAR)
### Question:
What is the average area for code 98030 with population over 312?
### Answer:
SELECT AVG(area__km_2__) FROM table_name_80 WHERE code = 98030 AND population > 312