X
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X  Code Point 

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The capital Latin letter X is used to represent a random variable in statistics
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.
A random variable represents an event whose outcome is unknown.
A probability distribution is a function that describes the likeliness of a random variable to take on different values.