CREATE TABLE table_51767 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the attendance at Moorabbin Oval?
SELECT AVG("Crowd") FROM table_51767 WHERE "Venue" = 'moorabbin oval'
SELECT AVG("Crowd") FROM "table_51767" WHERE "Venue" = 'moorabbin oval'