That there is quite a large amount of variation between the observations.
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A standard deviation in statistics is the amount at which a large number of given values in a set might deviate from the average. A percentile deviation represents this deviation as a percentage of the range.
that you have a large variance in the population and/or your sample size is too small
The standard deviation of the population. the standard deviation of the population.
The standard deviation is 0.
The standard deviation in a standard normal distribution is 1.