A student measures the length of a spring with a ruler. The readings obtained are: $14.9\,\text{cm}$, $14.8\,\text{cm}$, $14.8\,\text{cm}$, $14.7\,\text{cm}$. What is the mean length of the spring to three significant figures?
- A$14.8\,\text{cm}$
- B$14.9\,\text{cm}$
- C$15.0\,\text{cm}$
- D$15\,\text{cm}$