A project consists of four activities with information as shown in the table.What is the overall variance of the project's duration? 
Definitions:
Vagus
Referring to the vagus nerve, the tenth cranial nerve, which innervates various organs and influences functions such as heart rate, digestive tract movement, and reflex actions.
Peristalsis
The wave-like muscle contractions that move food through the digestive tract.
Cerebrospinal Fluid
The clear, protective fluid circulating around the brain and spinal cord.
Hydrocephalus
A condition characterized by an abnormal accumulation of cerebrospinal fluid within the cavities of the brain, which can cause increased pressure and swelling.
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