Use the STDEV() function.
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Here's how you do it in Excel: use the function =STDEV(<range with data>). That function calculates standard deviation for a sample.
A worked out example is shown in the related link. There are a number of calculators that do this automatically. Also, the Excel program (and most other spreadsheet programs) include a standard deviation function. In Excel, it is +stdev(a1:a10) for a list of numbers from a1 to a10.
The standard deviation of the population. the standard deviation of the population.
The standard deviation is 0.
The standard deviation in a standard normal distribution is 1.