What's the mean attendance number when the record is 12-4 and the average is less than 10,027?
CREATE TABLE "cintas_center" (
  "season" text,
  "record" text,
  "pct" real,
  "games" real,
  "attendance" real,
  "average" real,
  "sellouts" real
);
SELECT AVG("attendance") FROM "cintas_center" WHERE "record"='12-4' AND "average"<'10,027';