what week number was at memorial stadium?
CREATE TABLE table_name_53 (week INTEGER, game_site VARCHAR)
SELECT AVG(week) FROM table_name_53 WHERE game_site = "memorial stadium"
### 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"