The idea is to know how much the values "spread out" from the average.
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Units of measure do follow the standard deviation.
Standard deviation is a measure of the spread of data.
The standard deviation is a measure of how spread out the numbers are. Three points is needed to calculate a statistically valid meaningful standard deviation.
1. Standard deviation is not a measure of variance: it is the square root of the variance.2. The answer depends on better than WHAT!
Standard deviation is a measure of how spread out a set of numbers are from each other. It has a variety of uses in statistics.