What was the average size of the crowd for games where the home team had a score of 10.10 (70)?
CREATE TABLE "round_17" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);
SELECT AVG("crowd") FROM "round_17" WHERE "home_team_score"='10.10 (70)';