Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_74604 ( "Home team" text, "Home team score" text, "Away team" text, "Away team score" text, "Venue" text, "Crowd" real, "Date" text )

### Question ###
How many people in the crowd with north melbourne as an away team?

### Accurate SQL ###

SELECT SUM("Crowd") FROM table_74604 WHERE "Away team" = 'north melbourne'