What is the average crowd size for an away team with a score of 14.2 (86)?
CREATE TABLE "round_13" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);
SELECT SUM("crowd") FROM "round_13" WHERE "away_team_score"='14.2 (86)';