In what Week were there less than 30,348 in Attendance with a Result of W 37-21?
CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "attendance" real
);
SELECT SUM("week") FROM "schedule" WHERE "attendance"<'30,348' AND "result"='w 37-21';