What is the average episode # located in Tanzania and whose # in season is larger than 5?
CREATE TABLE "season_4_2001_2002" (
  "episode_num" real,
  "num_in_season" real,
  "episode_name" text,
  "airdate" text,
  "location" text
);
SELECT AVG("episode_num") FROM "season_4_2001_2002" WHERE "location"='tanzania' AND "num_in_season">5;