What was the total number of average attendance for games of 1311?
CREATE TABLE "outdoor_sports" (
  "league" text,
  "sport" text,
  "season" text,
  "num_of_teams" real,
  "games" real,
  "total_attendance" text,
  "average_attendance" real
);
SELECT SUM("average_attendance") FROM "outdoor_sports" WHERE "games"=1311;