How many episodes had 11.86 million US viewers?
CREATE TABLE table_28215780_4 (
    no_in_series VARCHAR,
    us_viewers__millions_ VARCHAR
)
SELECT COUNT(no_in_series) FROM table_28215780_4 WHERE us_viewers__millions_ = "11.86"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many episodes had 11.86 million US viewers? ### Input: CREATE TABLE table_28215780_4 (
    no_in_series VARCHAR,
    us_viewers__millions_ VARCHAR
) ### Response: SELECT COUNT(no_in_series) FROM table_28215780_4 WHERE us_viewers__millions_ = "11.86"