user: Question: What is the average crowd size 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: ['Melbourne', '17.16 (118)', 'St Kilda', '3.3 (21)', 'MCG', 15624.0, '9 July 1955']
SQL:

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