Bell Curve

The pseudonym for the shape of the Normal curve aka the Normal Distribution.

Conveniently, it's shaped a bit like a bell, with a rounded peak in the middle that drops away identically on each side to form the curvy, sloping sides of the bell. The bell curve plots the probability of randomly selecting a data point from a whole mess of data points against the value of that data point. The most likely probability (located at the peak in the middle) is always the mean of the data set. As we choose data points that are both larger and smaller than the mean, we get smaller and smaller probabilities.