What was the average score for the couple that had 4 dances?
CREATE TABLE "averages" (
  "rank_by_average" real,
  "place" real,
  "couple" text,
  "total_points_earned" real,
  "number_of_dances" real,
  "average" text
);
SELECT "average" FROM "averages" WHERE "number_of_dances"=4;