Who said that "average or mean deviation is the arithmetic mean of all the deviations when we disregard the algebraic signs"? - [MCQ's]

Q. Who said that "average or mean deviation is the arithmetic mean of all the deviations when we disregard the algebraic signs"?

1. Hurlock
2. Guildford
3. Tyler
4. James

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👉 Answer – 2

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