Bell-shaped Distribution

distribution in statistics that resembles the outline of a bell when plotted on a graph.

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Bell-shaped Distribution is a distribution in graph or plot that forms the shape of a bell or a bell like outline.

external image distribution_normal.jpg
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Another Example:

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symmetric (bell-shaped)
symmetric (bell-shaped)

"If the shape of distribution is symmetric,we can also assume that mean is equal to median." [jeffril]