The decimal point is 1 digit(s) to the right of the |

   3 | 6
   4 | 39
   5 | 17
   6 | 26
   7 | 0445788
   8 | 222556679
   9 | 0124458
  10 | 0

The first, second, and third quartiles of the exam were 72, 82, and 89.5, respectively.