user: Question: When north melbourne is the Away team, what is the total number of the Crowd?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Melbourne', '16.16 (112)', 'St Kilda', '10.21 (81)', 'MCG', 25703.0, '6 May 1939']
SQL:

assistant: SELECT SUM("Crowd") FROM "Table" WHERE "Away team" = 'north melbourne';