What is the number of weeks where the venue was memorial stadium and the attendance was less than 41,252?
CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "venue" text,
  "attendance" real
);
SELECT COUNT("week") FROM "schedule" WHERE "venue"='memorial stadium' AND "attendance"<'41,252';