"In Statistics, μ is used as the symbol for the "population mean", a constant. It is the expected value of the sample mean, that equals the population mean.
In other words, μ symbolizes the true -and unknown- center of gravity of the population. We can think of μ as "life", the sample mean as "art", and the expected value of the sample mean as our attempt to discover and live life through art. Or to put it succinctly, we art the em -and thank goodness we are free to do that."
Thanks to Alecos Papadopoulos
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