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_name_96 (viewers__m_ VARCHAR, share VARCHAR)
### Question:
What is the average rating of viewers 18 to 49 where the total viewer count is 3.93 million and share less than 4?
### Answer:
SELECT AVG(18 AS _49) FROM table_name_96 WHERE viewers__m_ = 3.93 AND share < 4