Standard deviation = square root of variance.
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Standard deviation is how much a group deviates from the whole. In order to calculate standard deviation, you must know the mean.
You cannot; there is insufficient information.
It depends on the data. The standard deviation takes account of each value, therefore it is necessary to know the values to find the sd.
The idea is to know how much the values "spread out" from the average.
the mean and the standard deviation