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:
Sample Size
The number of observations or data points collected or selected from a population for the purpose of statistical analysis.
Sample Proportion
A statistic that estimates the fraction of the total population that exhibits a specific attribute, calculated from a sample.
Standard Error
A statistical measure that estimates the accuracy with which a sample distribution represents a population by using standard deviation.
Random Sample
A subset of a statistical population in which each member has an equal chance of being chosen.
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