A company has the data shown in the chart below concerning its forecast performance over the past four time periods. 
Complete the chart and compute the MAD.
Definitions:
Engagement Letter
A written agreement that outlines the scope of work, terms, and responsibilities between a professional service provider and their client.
Accounting Services
Professional services involving the maintenance, auditing, and analysis of financial records and transactions for individuals or businesses.
Contractual Terms
Stipulations, clauses, and conditions outlined in a contract that define the obligations, rights, and duties of the parties involved.
Securities Act Of 1933
A U.S federal law enacted to ensure more transparency in financial statements so investors can make informed decisions about investments, and to establish laws against misrepresentation and fraudulent activities in the securities markets.
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