List the total number of institutions founded in Rock Island, Illinois.
CREATE TABLE table_18483171_1 (founded VARCHAR, location VARCHAR)
SELECT COUNT(founded) FROM table_18483171_1 WHERE location = "Rock Island, Illinois"
### Context: CREATE TABLE table_18483171_1 (founded VARCHAR, location VARCHAR) ### Question: List the total number of institutions founded in Rock Island, Illinois. ### Answer: SELECT COUNT(founded) FROM table_18483171_1 WHERE location = "Rock Island, Illinois"