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_23 (number_of_languages INTEGER, frequency VARCHAR, publisher VARCHAR)
### Question:
What is the mean number of languages for the monthly frequency when the publisher is the hearst corporation?
### Answer:
SELECT AVG(number_of_languages) FROM table_name_23 WHERE frequency = "monthly" AND publisher = "hearst corporation"