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You calculate the mean.For each observation, you calculate its deviation from the mean.Convert the deviation to absolute deviation.Calculate the mean of these absolute deviations.
The mean average deviation is the same as the mean deviation (or the average deviation) and they are, by definition, 0.
In the same way that you calculate mean and median that are greater than the standard deviation!
You don't need to. Average deviation (about the mean) is always zero!
You cannot "solve" a mean squared deviation". You can calculate it or use it, but there is nothing to solve!