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Find the Standard Deviation Step 1: Find the variance. Step 2: Take the square root of the variance. mean= 3+8+15+13+15+15 6 =11.5 Step 1: Find the variance. To calculate it, you take the difference of each number and the mean. Then you square them, and take the average. 3−11.5 2 8−11.5 2 15−11.5 2 13−11.5 2 15−11.5 2 15−11.5 2 123.5 6 =20.58 3 Step 2: Take the square root of the variance. 20.58 3 σ=4.536.. + The standard deviation is used to find how spread out a set of numbers are. 123.5

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