Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['School', 'City', 'Team Name', 'Enrollment 08-09', 'IHSAA Class', 'County', 'Year Joined', 'Previous Counference']

### Response:
SELECT AVG Enrollment 08-09 FROM table WHERE Previous Counference = lake AND IHSAA Class = 3a