Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_77 ( pick__number INTEGER, college VARCHAR, overall VARCHAR )

### Question ###
What is the mean pick number for Iowa College when the overall is less than 200?

### Accurate SQL ###

SELECT AVG(pick__number) FROM table_name_77 WHERE college = "iowa" AND overall < 200