user: Question: What was the average crowd size of games held at Glenferrie Oval?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Collingwood', '12.12 (84)', 'South Melbourne', '6.8 (44)', 'Victoria Park', 24637.0, '24 June 1961']
SQL:

assistant: SELECT AVG("Crowd") FROM "Table" WHERE "Venue" = 'Glenferrie Oval';