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: On what date did Fitzroy have a home team score of 8.13 (61)?
SQL: SELECT "date" FROM "round_9" WHERE "home_team_score"='8.13 (61)';

Question: What is the average crowd for the home team of North Melbourne?
SQL: SELECT AVG("crowd") FROM "round_9" WHERE "home_team"='north melbourne';