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Squaring each of these results, you get 9, 1, 1, and 9. Adding these up, rosetta stone 3 user guide sum is 20. Finally, you take the square root of 6. The standard deviation for these four quiz scores is 2. Because calculating the standard deviation involves many steps, in most cases you have a computer calculate it for you. However, knowing how to calculate the ghide deviation helps you better interpret this statistic and can help you figure out when the statistic may be wrong.