From the online calculator, see related link, the standard deviation is 4.06202.
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The standard deviation of 2 3 5 6 = 1.8257
Standard deviation is the square root of the mean. The mean for this set is (2 + 4 + 3 + 7)/4 = 16/4 = 4; the square root of this is 2.
It would be 3*5 = 15.
Absolute deviation from what?
The mean is the average of the numbers in your results. For example if your results are 7, 3 and 14, then your mean is 8. Numerically, (7+3+14)/3 The standard deviation measures how widely spread the values in a data set are.