user: Question: What is the crowd size of the match featuring North Melbourne as the away team?
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 "Crowd" FROM "Table" WHERE "Away team" = 'North Melbourne';