CREATE TABLE table_30596 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( million ) " TEXT)

For how many series were there 11.84 million watchers?
SELECT "No. in series" FROM table_30596 WHERE "U.S. viewers (million)" = '11.84'
SELECT "No. in series" FROM "table_30596" WHERE "U.S. viewers (million)" = '11.84'