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_90 (rank INTEGER, director VARCHAR)
### Question:
What is the average rank for the film directed by michael bay?
### Answer:
SELECT AVG(rank) FROM table_name_90 WHERE director = "michael bay"