Google

To compute the standard deviation for a set of scores (e.g., $$3, 5, 4, 2, 7, 6, 5$$, and $$8$$, which have a mean of $$5$$), first determine the difference between each score and the mean. Square each difference to make all values positive, then find the mean of these squared differences (the variance), which is $$28 / 8 = 3.50$$. Finally, the square root of the variance provides the standard deviation: $$\sqrt{3.50} = 1.87$$.

Learn Before

Related