x̄
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x̄  Code Point 

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The x bar symbol is used in statistics to represent the sample mean of a distribution. Read more…
The Latin small letter x is used to represent a variable or coefficient. In algebra, x is often used to represent an unknown value. The symbol x is also used to represent the horizontal dimension in the 2D cartesian coordinate system.
The combining macron character is used to draw a macron (horizontal bar) over the symbol it is combined with.
The Greek letter μ (mu) is used in statistics to represent the population mean of a distribution.
The sample mean, also called the arithmetic mean, is the average of a sample space. To calculate the sample mean, sum all the data points in a sample space and then divide by the number of elements.