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_28 (enrollment_08_09 INTEGER, previous_counference VARCHAR, ihsaa_class VARCHAR)

### Question ###
What is the average enrollment 08=09, for the team that had a previous conference of lake and IHSAA class of 3A?

### Accurate SQL ###

SELECT AVG(enrollment_08_09) FROM table_name_28 WHERE previous_counference = "lake" AND ihsaa_class = "3a"