A project consists of four activities with information as shown in the table.What is the overall standard deviation of the project? 
Definitions:
Zygote
The initial cell formed when a new organism is conceived, resulting from the union of an egg and a sperm cell.
Piaget's Stages
Piaget's Stages of cognitive development propose a series of four stages in which children's intellectual abilities evolve from infancy through adolescence.
Cognitive Development
The process of growth and change in intellectual capabilities such as thinking, problem-solving, and decision-making.
Cross-Sectional
A type of study or analysis that examines data from a population at one specific point in time.
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