What are the evening gown scores of contestants whose average is 9.266?
CREATE TABLE "final_competition_scores" (
  "country" text,
  "preliminary" text,
  "interview" text,
  "swimsuit" text,
  "evening_gown" text,
  "average" text
);
SELECT "evening_gown" FROM "final_competition_scores" WHERE "average"='9.266';