What was the sum of the crowds in the matches where the away team scored 11.8 (74)?
CREATE TABLE "round_6" (
  "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_6" WHERE "away_team_score"='11.8 (74)';