Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_2791668_1 (us_viewers__millions_ VARCHAR, directed_by VARCHAR)
### Question:
how many millions of North American people saw the episode whose director was Ed Sherin? 
### Answer:
SELECT us_viewers__millions_ FROM table_2791668_1 WHERE directed_by = "Ed Sherin"