CREATE TABLE "round_15" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: How many people attended the game where the home team scored 10.13 (73)?
SQL: SELECT AVG("crowd") FROM "round_15" WHERE "home_team_score"='10.13 (73)';

Question: What is the lowest amount of people that attended a game where the home team scored 10.13 (73)?
SQL: SELECT MIN("crowd") FROM "round_15" WHERE "home_team_score"='10.13 (73)';

Question: On what date was Richmond hosted as the away team?
SQL: SELECT "date" FROM "round_15" WHERE "away_team"='richmond';