Table: t_1928_vfl_match_4
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: What is the average crowd size when the home side scores 8.9 (57)?
SQL: SELECT AVG("crowd") FROM t_1928_vfl_match_4 WHERE "home_team_score" = '8.9 (57)'

Question: What is the home team's score for north melbourne?
SQL: SELECT "home_team_score" FROM t_1928_vfl_match_4 WHERE "home_team" = 'north melbourne'

Question: What is the average crowd size when the home team scores 16.9 (105)?
SQL: SELECT AVG("crowd") FROM t_1928_vfl_match_4 WHERE "home_team_score" = '16.9 (105)'