It is 3.605551275
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7.087547766 is the standard deviation for those figures.
For 8 9 10: σ=1
5.142857143 is the mean.12.43956044 is the variance.3.526976104 is the standard deviation.
It is (124 - 100)/8 = 24/8 = 3
The mean is 12 and each observation is 8 units away from 12.