A project consists of four activities with information as shown in the table. What is the overall standard deviation of the project? 
Definitions:
Action Potentials
Short-lasting events in which the electrical membrane potential of a cell rapidly rises and falls, allowing neurons to transmit signals along nerve fibers.
Cohort Differences
Variabilities or distinctions observed between defined groups of individuals, often distinguished by their age, generation, or shared experiences.
Age-related Variation
Differences in behavior, physiology, or characteristics among individuals of different ages, often due to developmental processes or aging.
Adult Intelligence
The cognitive ability of an adult, encompassing aspects such as logical reasoning, problem-solving skills, and the capacity to understand complex concepts.
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