=having nature or characteristics of a variable=
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Z is a variable with mean 0 and variance 1.Z is a variable with mean 0 and variance 1.Z is a variable with mean 0 and variance 1.Z is a variable with mean 0 and variance 1.
isolation of the variable means to get the variable on one side of the equation and the integers on the other side
both Stated mathematically, it means ( 1 + 2 ) .
A variable is a (letter) symbol that represents one or more numbers
Empirical Distribution: based on measurements that are actually taken on a variable. Theoretical Distribution: not constructed on measurements but rather by making assumptions and representing these assumptions mathematically.