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

### Instruction:
What are the average points of Scuderia Scribante with a Brabham bt11 chassis before 1968?

### Inputs:
table_name: table, columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']

### Response:
SELECT AVG Points FROM table WHERE Entrant = scuderia scribante AND Chassis = brabham bt11 AND Year < 1968