Step by step on how to find the standard deviation please.

A survey of 15 large cities noted the average weekly commute times, in hours, of the residents of each city. The results are recorded in the table below. Weekly commute time (h) 5.5 5.0 5.6 5.0 3.6 3.4 5.8 4.9 3.5 6.4 5.7 3.9 5.7 4.7 4.4 Find the mean and sample standard deviation of these data. Round to the nearest hundredth. mean sample standard deviation