I need to find the std. deviation of the velocity values and the uncertainty range

Table 1: Timing Data of Ball on Table Distance between tape strips = 16in in meters = 0.406m Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Time (s) 29s 28s .24s 26s .29s Velocity (m/s) 1.4m/s 1.45m/s 1.70m/s 1.56m/s 1.4m/s Uncertainty Range = Average= 1.502m/s