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

### Instruction:
What's the average rebs before 1972?

### Inputs:
table_name: table, columns: ['Player', 'Pos.', 'From', 'School/Country', 'Rebs', 'Asts']

### Response:
SELECT AVG Rebs FROM table WHERE From < 1972