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_42 (series__number INTEGER, directed_by VARCHAR)
### Question:
What is the average of the Series #s that were directed by Matthew Penn?
### Answer:
SELECT AVG(series__number) FROM table_name_42 WHERE directed_by = "matthew penn"