What is the mean pick number for Iowa College when the overall is less than 200?
CREATE TABLE table_name_77 (
    pick__number INTEGER,
    college VARCHAR,
    overall VARCHAR
)
SELECT AVG(pick__number) FROM table_name_77 WHERE college = "iowa" AND overall < 200
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the mean pick number for Iowa College when the overall is less than 200? ### Input: CREATE TABLE table_name_77 (
    pick__number INTEGER,
    college VARCHAR,
    overall VARCHAR
) ### Response: SELECT AVG(pick__number) FROM table_name_77 WHERE college = "iowa" AND overall < 200