The “Bell Curve” is the common expression for what is otherwise known as Standard Normal Distribution. The concept basically states that in any category, most members of the category will be grouped in the middle, with fewer members at the extremes. Wikipedia provides a fancy definition:
In probability theory, the normal (or Gaussian) distribution, is a continuous probability distribution that is often used as a first approximation to describe real-valued random variables that tend to cluster around a single mean value. The graph of the associated probability density function is “bell”-shaped, and is known as the Gaussian function or . . . → Read More: The Bell Curve Theory of Life
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