It is a measure of the spread of the data around its mean value.
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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.
It is 0.
(As in Jeopardy) - What is "standard deviation"?
A single number, such as 478912, always has a standard deviation of 0.
Yes it does. The center, which is the mean, affects the standard deviation in a potisive way. The higher the mean is, the bigger the standard deviation.