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Why do you derive mean deviation from mean?

Updated: 8/19/2019
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13y ago

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This means the average deviation from the average. So first find the average. Then, one by one for each item, find the difference of the item from your average. Ignore the sign when the difference is negative. Find the average of these by adding up and dividing by the number of terms.

Instead of ignoring the signs it is common to square each difference, add up all the squares and divide by the number of terms (= mean square) and take the square root (= root mean square. or r.m.s).

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13y ago
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Q: Why do you derive mean deviation from mean?
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