A pendulum is oscillating. Five students each record the time for ten full swings. Three of the students obtain $17.2\,\text{s}$. A further student records $16.9\,\text{s}$, and the last student records $17.0\,\text{s}$. What is the mean period of the pendulum?
- A$1.69\,\text{s}$
- B$1.70\,\text{s}$
- C$1.71\,\text{s}$
- D$1.72\,\text{s}$