What is the total series numbers that is directed by Jefferson Kibbee and has a production code of 2398191?
CREATE TABLE "season_7_1998_1999" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "director" text,
  "writer_s" text,
  "original_air_date" text,
  "production_code" text
);
SELECT SUM("no_in_series") FROM "season_7_1998_1999" WHERE "director"='jefferson kibbee' AND "production_code"='2398191';