user: Question: What was the average crowd size at Victoria Park?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Hawthorn', '15.15 (105)', 'North Melbourne', '11.10 (76)', 'Princes Park', 14417.0, '5 April 1975']
SQL:

assistant: SELECT AVG("Crowd") FROM "Table" WHERE "Venue" = 'Victoria Park';