SELECT avg(T2.edispl) FROM CAR_NAMES AS T1 JOIN CARS_DATA AS T2 ON T1.MakeId  =  T2.Id WHERE T1.Model  =  'volvo';
What is the average edispl of the cars of model volvo?
SELECT avg ( T2.edispl ) FROM CAR_NAMES AS T1 JOIN CARS_DATA AS T2 ON T1.MakeId = T2.Id WHERE T1.Model = 'volvo ' ;
select avg ( t2 . edispl ) from car_names as t1 join cars_data as t2 on t1 . makeid = t2 . id where t1 . model = value
What is the average edispl of the cars of model volvo ?