What state has a semifinal average of 8.538 (8) ?
CREATE TABLE "final_competition" (
  "state" text,
  "preliminary_average" text,
  "interview" text,
  "swimsuit" text,
  "evening_gown" text,
  "semifinal_average" text
);
SELECT "state" FROM "final_competition" WHERE "semifinal_average"='8.538 (8)';