CREATE TABLE table_21978 ("Rank by average" FLOAT, "Place" FLOAT, "Couple" TEXT, "Total points" FLOAT, "Number of dances" FLOAT, "Average" TEXT)

What are the total points for the team that averages 17.8?
SELECT "Total points" FROM table_21978 WHERE "Average" = '17.8'
SELECT "Total points" FROM "table_21978" WHERE "Average" = '17.8'