text: 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 department (num_employees INTEGER, ranking INTEGER)
  ### Question:
  What is the average number of employees of the departments whose rank is between 10 and 15?
  ### Answer:
  SELECT AVG(num_employees) FROM department WHERE ranking BETWEEN 10 AND 15