AUTOMATA FINAL EXAM
                     
                 X
   number        X           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
     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.