CREATE TABLE table_33757 ("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 when the home side scores 8.9 (57)?
SELECT AVG("Crowd") FROM table_33757 WHERE "Home team score" = '8.9 (57)'
SELECT AVG("Crowd") FROM "table_33757" WHERE "Home team score" = '8.9 (57)'