they are the same.
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no the standard deviation is not equal to mean of absolute distance from the mean
One thing it means is that the two distances from the point to the ends of the segment are equal.
The mean and variance are equal in the Poisson distribution. The mean and std deviation would be equal only for the case of mean = 1. See related link.
regular polygon mean equal sides, equal angles irregular polygon mean it is not equal :)
equal set mean the set is equal equal est means that the set is equal