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 CARS_DATA (edispl INTEGER, Id VARCHAR); CREATE TABLE CAR_NAMES (MakeId VARCHAR, Model VARCHAR)
### Question:
What is the average edispl of the cars of model volvo?
### Answer:
SELECT AVG(T2.edispl) FROM CAR_NAMES AS T1 JOIN CARS_DATA AS T2 ON T1.MakeId = T2.Id WHERE T1.Model = 'volvo'