Which away team score had a home team score of 15.8 (98)?
CREATE TABLE "round_17" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "ground" text,
  "crowd" real,
  "date" text,
  "report" text
);
SELECT "away_team_score" FROM "round_17" WHERE "home_team_score"='15.8 (98)';