What is the average attendance against the expos?
CREATE TABLE table_name_57 (attendance INTEGER, opponent VARCHAR)
SELECT AVG(attendance) FROM table_name_57 WHERE opponent = "expos"
### Context: CREATE TABLE table_name_57 (attendance INTEGER, opponent VARCHAR) ### Question: What is the average attendance against the expos? ### Answer: SELECT AVG(attendance) FROM table_name_57 WHERE opponent = "expos"