A charter school requires all of its teachers to grade each of their six classes on a curved scale. The top 15% of each class receives an A and the bottom 5% fails the class. This system is not fair. If a student is in an exceptionally gifted class, they could fail or receive a poor grade even if they did good work, while a student in an easier class could receive an A for poor work. Furthermore, grades are always arbitrary and teachers are likely to reward students they like better with higher marks.
Which of the following most accurately expresses the conclusion drawn in the argument?
A)Some schools require their teachers to rank students.
B)A fair ranking system involves a certain proportion of students receiving an A and some students receiving an F.
C)No matter what ranking system is used, teachers are likely to reward their favorite students with high marks.
D)A quota system for each of a teacher's classes is not a fair way to grade students.
E)More students deserve to fail than this system allows.

Question

Quizplus · Accepted Answer

The main conclusion of the argument is that a quota system for each of a teacher's classes is not a fair way to grade students. The passage describes the grading system and then points out the weaknesses of the system in order to prove answer D, making it the main point of the passage.

A Charter School Requires All of Its Teachers to Grade