A company has developed a linear trend model to forecast monthly sales.The following data show the actual sales and the "fitted" sales for months 1-12. 
Based on these data,what is the value for the mean absolute deviation for months 1-12?
Definitions:
Employ Employees
The act of hiring individuals to perform services or tasks for compensation.
Partnership Business
An officially recognized form of enterprise undertaken by two or more participants, who equally manage the business and its profits.
Agent
A person authorized to act on behalf of another, often in business transactions.
Employee
An individual who provides labor or services to another person or business in exchange for compensation under agreed terms.
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