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_87 (frequency INTEGER, type VARCHAR, brand VARCHAR)
### Question:
What is the average Frequency, when Type is "Norteño", and when Brand is "La Cotorra"?
### Answer:
SELECT AVG(frequency) FROM table_name_87 WHERE type = "norteño" AND brand = "la cotorra"