A project consists of four activities with information as shown in the table. What is the overall variance of the project's duration? 
Definitions:
Calculators
Electronic devices or software applications used for making mathematical calculations, ranging from basic arithmetic to complex computations.
Upgrading
The process of improving or enhancing a system, equipment, or software to boost performance or capabilities.
Industrial Fiber
Textiles and filaments used in the industrial sector for various applications, including manufacturing and construction.
Molasses
A thick, dark syrup produced during the refining of sugar cane or sugar beets into sugar.
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