user: Question: Which Crowd has an Away team score of 9.21 (75)?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['North Melbourne', '12.16 (88)', 'St Kilda', '9.10 (64)', 'Arden Street Oval', 7000.0, '22 May 1948']
SQL:

assistant: SELECT "Crowd" FROM "Table" WHERE "Away team score" = '9.21 (75)';