A project consists of four activities with information as shown in the table. What is the overall standard deviation of the project? 
Definitions:
Agency
A relationship between two parties in which one party (the agent) agrees to represent or act for the other (the principal).
Improbable
Unlikely to occur or be true.
Estopped
Estopped refers to a legal principle that prevents a person from arguing something contrary to a claim they previously made or agreed to by their actions or words.
Requisite Authority
The necessary or required power, permission, or jurisdiction to perform an action or enforce a policy.
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