A project consists of four consecutive tasks that have average duration and worst-case duration estimates (in days) as shown in the table. Use Newbold's model to determine the aggregated buffer of one standard deviation for this project. 
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Marketing Problems
Challenges or obstacles that businesses face in reaching their target markets, positioning their brand, or effectively promoting their products or services.
Research Methods
Systematic techniques used to plan, conduct, and analyze research to increase understanding of a topic or issue.
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Trend Extrapolation
The analytical process of using past data to forecast future events or trends, assuming that existing patterns will continue.
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