CREATE TABLE table_16782 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

How many titles were directed in series 79?
SELECT COUNT("Directed by") FROM table_16782 WHERE "No. in series" = '79'
SELECT COUNT("Directed by") FROM "table_16782" WHERE "No. in series" = '79'