CREATE TABLE "round_9" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: What is the average crowd where the home team scored 8.15 (63)?
SQL: SELECT AVG("crowd") FROM "round_9" WHERE "home_team_score"='8.15 (63)';