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_91 (pos INTEGER, car__number VARCHAR, driver VARCHAR)
### Question:
Which Pos has a Car # smaller than 18, and a Driver of mike skinner?
### Answer:
SELECT AVG(pos) FROM table_name_91 WHERE car__number < 18 AND driver = "mike skinner"