AUTOMATA EXAM 2

                          X           X
                          X     X     X
 number                   X     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
------------------------------------------------------
56-60 61-65 66-70 71-75 76-80 81-85 86-90 91-95 96-100
                       grades

The histogram shows the distribution of grades.