CREATE TABLE table_41767 ("Season" TEXT, "Series" TEXT, "Team Name" TEXT, "Races" FLOAT, "Poles" FLOAT, "Wins" FLOAT, "Points" TEXT, "Final Placing" TEXT)

In the 2005 season, how many races did the 15th place team complete?
SELECT AVG("Races") FROM table_41767 WHERE "Final Placing" = '15th' AND "Season" = '2005'
SELECT AVG("Races") FROM "table_41767" WHERE "Final Placing" = '15th' AND "Season" = '2005'