A company has the information shown in the chart below regarding its forecast performance in the past three periods. 
What is the mean absolute deviation (MAD) ?
Definitions:
Geographical Region
A specific area or part of the world distinguished by specific characteristics, which can include cultural, natural, or administrative features.
Cohort
A group of individuals sharing a common characteristic, typically born around the same time, who are studied over a period of time.
Psychoanalytic Theory
A theory of psychology and human behavior that emphasizes unconscious motives and conflicts as the primary determinants of human behavior.
Unconscious Needs
Desires or requirements of which an individual might not be aware but which influence behaviors and emotions.
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