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_27833469_1 (series__number VARCHAR, us_viewers__millions_ VARCHAR)
### Question:
How many series numbers are there when there were 15.8 u.s. viewers (millions)?
### Answer:
SELECT COUNT(series__number) FROM table_27833469_1 WHERE us_viewers__millions_ = "15.8"