SELECT avg(T2.rating) FROM artist AS T1 JOIN song AS T2 ON T1.artist_name  =  T2.artist_name WHERE T1.gender  =  "Female"
How many songs, on average, are sung by a female artist?
SELECT avg ( T2.rating ) FROM artist AS T1 JOIN song AS T2 ON T1.artist_name = T2.artist_name WHERE T1.gender = `` Female ''
select avg ( t2 . rating ) from artist as t1 join song as t2 on t1 . artist_name = t2 . artist_name where t1 . gender = value
How many songs , on average , are sung by a female artist ?