CREATE TABLE table_33152 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the sum of crowd(s) when north melbourne is away?
SELECT SUM("Crowd") FROM table_33152 WHERE "Away team" = 'north melbourne'
SELECT SUM("Crowd") FROM "table_33152" WHERE "Away team" = 'north melbourne'