CREATE TABLE table_51894 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

How many people attended the North Melbourne game?
SELECT AVG("Crowd") FROM table_51894 WHERE "Home team" = 'north melbourne'
SELECT AVG("Crowd") FROM "table_51894" WHERE "Home team" = 'north melbourne'