The Grades on a Statistics Exam for a Sample of Students

Multiple Choice

The grades on a statistics exam for a sample of students are as follows: If A+ = 90%-100%
A = 80%-89%
B+ = 75%-79%
B = 70%-74%
C+ = 65%-69%
C = 60%-64%
D+ = 55%-59%
D = 50%-54%
F = 0-49%
What is the most common letter grade earned?

A) A (80%-89%)
B) B (70%-74%)
C) C (60%-64%)
D) D (50%-54%)
E) F (0-49%)