A single number, such as 478912, always has a standard deviation of 0.
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Yes.
Standard deviations are measures of data distributions. Therefore, a single number cannot have meaningful standard deviation.
standard deviation is the square roots of variance, a measure of spread or variability of data . it is given by (variance)^1/2
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standard deviation only measures the average deviation of the given variable from the mean whereas the coefficient of variation is = sd\mean Written as "cv" If cv>1 More variation If cv<1 and closer to 0 Less variation