In a popular online role playing game, players can create detailed designs for their character's "costumes," or appearance. Eli sets up a website where players can buy and sell these costumes online. Information about the number of people who visited the website and the number of costumes purchased in a single day is listed below. 314 visitors purchased no costume.
68 visitors purchased exactly one costume.
17 visitors purchased more than one costume.

Based on these results, express the probability that the next person will purchase exactly one costume as a fraction in simplest form.