The formula for calculating the standard deviation is as follows:
S = √s2
It is simply the square root of the variance. The standard
deviation is the most common measure of spread and is very useful in
calculating many other statistics.
Example
If we continue with our tree
density example we just used we could now calculate the standard
deviation by taking the square root of 481. This would give us a
standard deviation equal to 21.9.
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