user: Question: What was the average crowd size when the away team was South Melbourne?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['North Melbourne', '7.4 (46)', 'South Melbourne', '10.17 (77)', 'Arden Street Oval', 15000.0, '5 July 1952']
SQL:

assistant: SELECT AVG("Crowd") FROM "Table" WHERE "Away team" = 'South Melbourne';