Exam statistics:

100 - 91: 3            Highest score: 99!

  90 - 81: 4

  80 - 71: 11

  70 - 61: 9            Average: 63.79

  60 - 51: 7

  50 - 41: 4

  40 - 31: 1

  30 - 21: 2

  20 -   0: 2            Lowest score:   9