CREATE TABLE table_57797 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the average home team score for Footscray?
SELECT "Home team score" FROM table_57797 WHERE "Home team" = 'footscray'
SELECT "Home team score" FROM "table_57797" WHERE "Home team" = 'footscray'