What was the average crowd size when the home team scored 9.8 (62)?
CREATE TABLE "round_4" (
  "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_4" WHERE "home_team_score"='9.8 (62)';