CREATE TABLE table_78498 ("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 attendance for Collingwood?
SELECT AVG("Crowd") FROM table_78498 WHERE "Home team" = 'collingwood'
SELECT AVG("Crowd") FROM "table_78498" WHERE "Home team" = 'collingwood'