what is the average enrollment when the team nickname is wolverines and founded is after 1817?
CREATE TABLE table_name_55 (enrollment INTEGER, team_nickname VARCHAR, founded VARCHAR)
SELECT AVG(enrollment) FROM table_name_55 WHERE team_nickname = "wolverines" AND founded > 1817
### Context: CREATE TABLE table_name_55 (enrollment INTEGER, team_nickname VARCHAR, founded VARCHAR) ### Question: what is the average enrollment when the team nickname is wolverines and founded is after 1817? ### Answer: SELECT AVG(enrollment) FROM table_name_55 WHERE team_nickname = "wolverines" AND founded > 1817