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The special character in your question didn't come through.

If it was a horizontal bar then it implies the sample mean; for example, for a sample of 'x' values (usually numbered 1, 2, 3, ..., n) x with a bar over it would mean the statistical average or mean of these numbers.


If the special character was a caret then it implies any of a variety of statistical estimators. For example, if you had assumed for some reason that the data had arisen from a population with a Poisson distribution with parameter 'lambda' then you might see a Greek letter lambda with a caret over it to represent a formula for calculating a statistical estimate of that parameter.

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Q: What does a above a number mean in statistics?
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What does mode mean in statistics?

The most commonly occurring number.


What is the symbol for population mean in statistics?

μ is the symbol for the population mean in statistics. fyi and related but not necessary for the above answer: the sample mean is , enunciated by saying "x" bar. hope this helped. Citation : http://en.wikipedia.org/wiki/Arithmetic_mean


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