user: ### NOW ANSWER:
Question: What's the average rebs before 1972?
Columns: ['Player', 'Pos.', 'From', 'School/Country', 'Rebs', 'Asts']
Types: ['text', 'text', 'real', 'text', 'real', 'real']
Sample row: ['James Edwards Category:Articles with hCards', 'C', 1983.0, 'Washington', 1490.0, 530.0]
SQL:

assistant: SELECT AVG("Rebs") FROM "Table" WHERE "From" < 1972.0;