MsRogers Uses a Grading System in Her High School Spanish

Essay

Ms.Rogers uses a grading system in her high school Spanish class in which students who average 60-69 percent receive a D,70-79 percent a C,80-89 percent a B,and 90-100 percent an A.Ms.Rogers has the reputation of being an excellent "expert" teacher.This year,18 of her 24 students earned a final grade of A and the other six students earned a B.Her new principal criticizes Ms.Rogers for using "an apparently invalid grading system that fails to provide adequate differentiation between students."
-Identify the type of grading system that Ms.Rogers is using.What are its general advantages and disadvantages?