For the following probability distribution: 
The variance is _____________.
Definitions:
Social Support System
The network of family, friends, colleagues, and other acquaintances upon which one relies for emotional, informational, and practical support.
Endocrine System
A system of ductless glands in various parts of the body that manufacture hormones and secrete them into the bloodstream, thus affecting cells in other parts of the body.
Cardiovascular System
The body's system comprising the heart and blood vessels, responsible for circulating blood and transporting nutrients and oxygen.
Depression
A syndrome in mental health where there is a chronic presence of depressive moods or a withdrawal from pleasurable activities, majorly impairing ordinary life activities.
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