CREATE TABLE table_15384 ("Position" FLOAT, "Club" TEXT, "Played" FLOAT, "Points" TEXT, "Wins" FLOAT, "Draws" FLOAT, "Losses" FLOAT, "Goals for" FLOAT, "Goals against" FLOAT, "Goal Difference" FLOAT)

What's the average number of played games from Rayo Vallecano with less than 12 wins?
SELECT AVG("Played") FROM table_15384 WHERE "Club" = 'rayo vallecano' AND "Wins" < '12'
SELECT AVG("Played") FROM "table_15384" WHERE "Club" = 'rayo vallecano' AND "Wins" < '12'