A student measures the time t t\,t taken for a small glider to pass between two light gates on a linear air track.
They record three values for time ttt:
0.53 s,0.48 s,0.56 s 0.53\text{ s}, \quad 0.48\text{ s}, \quad 0.56\text{ s} 0.53 s,0.48 s,0.56 sCalculate the mean value of time t t\,t to an appropriate number of significant figures.