The median is the middle number
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They are all forms of average.
Average is a synonym for mean (the mathematical term not the adjective)
The median of a set of values is the quantity at the mid-point, when the values are in ascending numerical order. For example, the median of the numbers 1, 3, 5, 7, 9 is 5. When there is an even number of terms, the median is the mean of the middle two terms. For example, the median of the numbers 1, 3, 5, 7 is 4.
The mean deviation from the median is equal to the mean minus the median.
It means multiply by two. As in "what is twice 3" that means what is 3x2.