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_7 ( _number_of_bids INTEGER, win__percentage VARCHAR, conference VARCHAR )

### Question ###
How many bids were there for the .500 win percentage in the Ohio Valley conference?

### Accurate SQL ###

SELECT SUM(_number_of_bids) FROM table_name_7 WHERE win__percentage = ".500" AND conference = "ohio valley"