how many millions of north american viewers had the episode whose director was Michael Lembeck? 
CREATE TABLE table_27714573_1 (us_viewers__millions_ VARCHAR, directed_by VARCHAR)
SELECT us_viewers__millions_ FROM table_27714573_1 WHERE directed_by = "Michael Lembeck"
### Context: CREATE TABLE table_27714573_1 (us_viewers__millions_ VARCHAR, directed_by VARCHAR) ### Question: how many millions of north american viewers had the episode whose director was Michael Lembeck?  ### Answer: SELECT us_viewers__millions_ FROM table_27714573_1 WHERE directed_by = "Michael Lembeck"