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_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