CREATE TABLE table_27910411_1 (us_viewers__millions_ VARCHAR, no_in_series VARCHAR)

How many items are listed for U.S. viewers for episode number 5 in the series?
SELECT COUNT(us_viewers__millions_) FROM table_27910411_1 WHERE no_in_series = 5
SELECT COUNT("us_viewers__millions_") FROM "table_27910411_1" WHERE "no_in_series" = 5