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It shows primarily that the measurement unit used for recording the data is very large. For example, the standard deviation of the heights of individuals, when recorded in metres, will be one hundredth of the standard deviation of their heights when recorded in centimetres. The process is known as coding.
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Deviations are calculated from some value: the mean, the median, the maximum or whatever. You subtract that value from each observed value.
The mean average deviation is the same as the mean deviation (or the average deviation) and they are, by definition, 0.