Mean Calculation from Exercise Data

A researcher collected data on the number of hours a group of 15 participants spent on physical exercises in a week, recorded as follows:

6, 8, 7, 10, 5, 6, 9, 8, 10, 4, 12, 9, 7, 5, 6

Based on this data, what is the mean (average) number of hours spent on exercise per participant?