Question: What is the average GPA of all students enrolled in the course that has the code ACCT-211?
SQL: SELECT avg ( T2.stu_gpa )  FROM enroll AS T1 JOIN student AS T2 ON T1.stu_num   =   T2.stu_num JOIN CLASS AS T3 ON T1.class_code   =   T3.class_code WHERE T3.crs_code   =   'ACCT-211'