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_53 (week INTEGER, game_site VARCHAR)
### Question:
what week number was at memorial stadium?
### Answer:
SELECT AVG(week) FROM table_name_53 WHERE game_site = "memorial stadium"