Probability of In-Person Study Preference

A statistical survey was conducted among a group of students to assess their preference for different study methods. The survey results were compiled, and the following frequencies of study methods used by 60 students were recorded:

Study Method: Online, In-person, Group Study

Frequency: 15, 30, 15 respectively.

Each type of study method is to be treated as a random category. If a student is randomly selected from this group, what is the probability that the student prefers 'In-person' study methods?

Express your answer as a fraction in simplest form.