SELECT avg(T2.gradepoint) FROM ENROLLED_IN AS T1 JOIN GRADECONVERSION AS T2 JOIN STUDENT AS T3 ON T1.Grade  =  T2.lettergrade AND T1.StuID  =  T3.StuID WHERE T3.LName  =  "Smith"
What is the average gradepoint for students with the last name Smith?
SELECT avg ( T2.gradepoint ) FROM ENROLLED_IN AS T1 JOIN GRADECONVERSION AS T2 JOIN STUDENT AS T3 ON T1.Grade = T2.lettergrade AND T1.StuID = T3.StuID WHERE T3.LName = `` Smith ''
select avg ( t2 . gradepoint ) from enrolled_in as t1 join gradeconversion as t2 join student as t3 on t1 . grade = t2 . lettergrade and t1 . stuid = t3 . stuid where t3 . lname = value
What is the average gradepoint for students with the last name Smith ?