Calculating Standard Deviation of Expenditures

A researcher collected the weekly expenditure data (in dollars) for a sample of 15 households. The recorded expenditures are as follows:

450, 480, 510, 470, 530, 550, 600, 520, 490, 460, 550, 570, 540, 580, 600

Using this data, calculate the standard deviation of the weekly expenditures.