In statistics, an inverted bell curve is a term used loosely or metaphorically to refer to a
bimodal distribution
In statistics, a multimodal distribution is a probability distribution with more than one mode (i.e., more than one local peak of the distribution). These appear as distinct peaks (local maxima) in the probability density function, as shown ...
that falls to a trough between two peaks, rather than (as in a standard
bell curve
In probability theory and statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is
f(x) = \frac e^\ ...
) rising to a single peak and then falling off on both sides.
[E.g., see .]
References
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Continuous distributions
Gaussian function