In what Week were there more than 23,875 in Attendance at Memorial Stadium with Detroit Lions as the Opponent?
CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "record" text,
  "game_site" text,
  "attendance" real
);
SELECT AVG("week") FROM "schedule" WHERE "attendance">'23,875' AND "game_site"='memorial stadium' AND "opponent"='detroit lions';