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_50 (erp_w INTEGER, frequency_mhz VARCHAR)
### Question:
Frequency MHz of 88.7 had what average erp w?
### Answer:
SELECT AVG(erp_w) FROM table_name_50 WHERE frequency_mhz = 88.7