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

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'