bell curve

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A curve that resembles the axial cross-section of a bell. One example is the graph of the probability density of a normal distribution. It is often assumed that every bell-curve must arise from a normal distribution, but this is not the case. For example, all the t-distributions (including the Cauchy distribution) also give rise to bell-curves. The term can also be used to describe a histogram that approximates a bell-curve.

The most common type of distribution for a variable. The term "bell curve" comes from the fact that the graph used to depict a normal distribution consists of a bell-shaped line.

The bell curve is also known as a normal distribution. The bell curve is less commonly referred to as a Gaussian distribution, after German mathematician and physicist Karl Gauss, who popularized the model in the scientific community by using it to analyze astronomical data.

Investopedia Says:
The highest point in the curve, or the top of the bell, represents the most probable event. All possible occurrences are equally distributed around the most probable event, which creates a downward-sloping line on each side of the peak. 

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