Database: college_3
Question: What is the maximum and minimum grade point of students who live in NYC?
SQL: select max(t2.gradepoint) ,  min(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.city_code  =  "nyc"