How many episodes were numbered 5?
CREATE TABLE "series_2_2000_2001" (
  "episode_num" real,
  "production_count" real,
  "original_airdate" text,
  "prod_code" text,
  "title" text,
  "viewing_figures_millions" text
);
SELECT COUNT("production_count") FROM "series_2_2000_2001" WHERE "episode_num"=5;