CREATE TABLE table_30151 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production" CLOB, "U.S. viewers  ( in millions ) " CLOB)

How many viewers in millions were there for episode 4 of this season?
SELECT COUNT("U.S. viewers (in millions)") FROM table_30151 WHERE "No. in season" = '4'
SELECT COUNT("U.S. viewers (in millions)") FROM "table_30151" WHERE "No. in season" = '4'