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:
Common Law Negligence
A legal principle that imposes a duty to act with the care and diligence that a reasonably prudent person would under the same circumstances, where failure to do so results in harm or damage to another.
Restatement (Second) of Torts
The Restatement (Second) of Torts is a legal treatise from the American Law Institute that summarizes the general principles of common law torts in the United States.
Professional Negligence
The failure of a professional to perform their services with the skill and care that should be exercised by competent professionals in the same field, leading to harm.
Nonclients
Individuals or entities that have not entered into a professional service relationship with certain professionals, such as lawyers or accountants, and consequently, the professional does not owe them the same duty of care.
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