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_97 (erp_w INTEGER, call_sign VARCHAR)
### Question:
What is the average ERP W for callsign K207BK?
### Answer:
SELECT AVG(erp_w) FROM table_name_97 WHERE call_sign = "k207bk"