Standard deviation calculation is somewhat difficult.
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Standard deviations are measures of data distributions. Therefore, a single number cannot have meaningful standard deviation.
Standard deviation is a measure of variation from the mean of a data set. 1 standard deviation from the mean (which is usually + and - from mean) contains 68% of the data.
The range is 9 and 3.01 is the standard deviation.
The data point is close to the expected value.
Standard deviation shows how much variation there is from the "average" (mean). A low standard deviation indicates that the data points tend to be very close to the mean, whereas high standard deviation indicates that the data are spread out over a large range of values.