AI EXAM 1 

 number                  X
of exams                 X     X 
             X           X     X    
       X     X     X     X     X       
       X     X     X     X     X     X  
       X     X     X     X     X     X    
      -----------------------------------
      0-50 51-60 61-70 71-80 81-90 91-100
                    grades

The histogram shows the distribution of grades.