CREATE TABLE table_65239 ("Stadium" TEXT, "Capacity" FLOAT, "City" TEXT, "Province" TEXT, "Home team ( s ) " TEXT)

What was the average capacity for v lez s rsfield?
SELECT AVG("Capacity") FROM table_65239 WHERE "Home team(s)" = 'vélez sársfield'
SELECT AVG("Capacity") FROM "table_65239" WHERE "Home team(s)" = 'vélez sársfield'