The mean is the average
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mean deviation =(4/5)quartile deviation
The mean deviation from the median is equal to the mean minus the median.
No. The average of the deviations, or mean deviation, will always be zero. The standard deviation is the average squared deviation which is usually non-zero.
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.
Mean and standard deviation are not related in any way.