CREATE TABLE table_29272 ("No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( in millions ) " TEXT)

How many directors directed an episode that reached 2.48 million viewers?
SELECT COUNT("Directed by") FROM table_29272 WHERE "U.S. viewers (in millions)" = '2.48'
SELECT COUNT("Directed by") FROM "table_29272" WHERE "U.S. viewers (in millions)" = '2.48'