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 college ( state VARCHAR, enr INTEGER )

### Question ###
What is the number of states that has some colleges whose enrollment is smaller than the average enrollment?

### Accurate SQL ###

SELECT COUNT(DISTINCT state) FROM college WHERE enr < (SELECT AVG(enr) FROM college)