For the following distribution: 
What is the mean of the distribution?
Definitions:
Nonidentical Twins
Twins born from two separate eggs fertilized at the same time, leading to siblings that share genetic similarities but are not genetically identical.
Biological Siblings
Siblings who share the same biological parents, fully related genetically.
Temperament
An individual's innate disposition or personality traits that significantly influence their behaviors and reactions across different situations.
Activity Level
A person's overall amount of physical energy and movement, which can be a characteristic of their behavior and temperament.
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