Table: vfl_1975_game
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: What was the average crowd size at Victoria Park?
SQL: SELECT AVG("crowd") FROM vfl_1975_game WHERE "venue" = 'victoria park'

Question: What is the crowd size of the match featuring North Melbourne as the away team?
SQL: SELECT MIN("crowd") FROM vfl_1975_game WHERE "away_team" = 'north melbourne'