what is the average rating given in Michelle reviews
SELECT AVG ( t1.rating ) FROM USER AS t2 JOIN review AS t1 ON t2.user_id  =  t1.user_id WHERE t2.name  =  "Michelle";
SELECT AVG ( t1.rating ) FROM USER AS t2 JOIN review AS t1 ON t2.user_id  =  t1.user_id WHERE t2.name  =  "Michelle";
[{'AVG ( t1.rating )': None}]