How many episodes had 11.86 million US viewers?
CREATE TABLE "season_3_2004" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "u_s_viewers_millions" text,
  "original_air_date" text
);
SELECT COUNT("no_in_series") FROM "season_3_2004" WHERE "u_s_viewers_millions"='11.86';