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_85 (quantity INTEGER, drg_number_s_ VARCHAR)
### Question:
What is average quantity, when DRG number is 99 011?
### Answer:
SELECT AVG(quantity) FROM table_name_85 WHERE drg_number_s_ = "99 011"