Consider the probability distribution below. 
The variance of x equals
Definitions:
Dependent Variable
In an experiment or statistical model, the variable that is expected to change as a result of manipulations in the independent variable.
Independent Variable
A factor in a study or simulation that is deliberately altered to see its impact on a variable that depends on it.
Total Sum Of Squares
A measure in statistics that quantifies the total variation of a dataset.
Dependent Variable
The variable in an experiment that is expected to change in response to changes in the independent variable.
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