A single number, such as 478912, always has a standard deviation of 0.
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Standard deviation is a measure of the spread of data.
No, if the standard deviation is small the data is less dispersed.
Standard deviation is the variance from the mean of the data.
Standard deviation helps planners and administrators to arrive at a figure that could be used to determine a range that can effectively describe a given set of numerical information/data; and based on which a decision concerning a system of those data can be made.
The smaller the standard deviation, the closer together the data is. A standard deviation of 0 tells you that every number is the same.