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The mathematical symbol for average is sometimes denoted by putting a line above the variable, like this:
_
X
The "Expectation value" of a random variable - is like a weighted average. E[X] or <X> or the Greek letter mu (µ) - are a few of the common symbols for the Expected Value of X.
A random variable may, for example, represent your high school grades for each course taken, where each course has a different weight. The expectation value would be your weighted average of high school grades.
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T
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z
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< this symbol can also mean less than
