CREATE TABLE table_28644 ("Rank by average" FLOAT, "Place" FLOAT, "Couple" TEXT, "Total points" TEXT, "Number of dances" FLOAT, "Average" TEXT)

What is every average when number of dances is 1?
SELECT "Average" FROM table_28644 WHERE "Number of dances" = '1'
SELECT "Average" FROM "table_28644" WHERE "Number of dances" = '1'