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_49 (overall INTEGER, school_club_team VARCHAR, round VARCHAR)
### Question:
What is the average overall rank of all players drafted from Duke after round 9?
### Answer:
SELECT AVG(overall) FROM table_name_49 WHERE school_club_team = "duke" AND round > 9