CREATE TABLE table_32933 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the average crowd size for games with north melbourne as the away side?
SELECT AVG("Crowd") FROM table_32933 WHERE "Away team" = 'north melbourne'
SELECT AVG("Crowd") FROM "table_32933" WHERE "Away team" = 'north melbourne'