What are the average play-offs that have an FA Cup greater than 3?
CREATE TABLE "topscorers" (
  "player" text,
  "club" text,
  "league" real,
  "play_offs" real,
  "fa_cup" real,
  "fa_trophy" real,
  "total" real
);
SELECT AVG("play_offs") FROM "topscorers" WHERE "fa_cup">3;