A mode is a value at which a probability mass function or specified probability density function attains its largest value. There may be more than one. For the normal distribution the unique mode equals the mean; the Maxwell speed distribution has mode and a larger mean speed. For a continuous probability distribution, a mode maximizes density rather than the probability of an exact value, which is zero. Density modes can change under a nonlinear change of variables, as the distinction between Maxwell-Boltzmann velocity distribution and Maxwell speed distribution illustrates.
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In statistics, the **mode** is defined as the value that appears most frequently in a data set. A data set may have one mode, more than one mode, or no mode at all: - **Unimodal**: A data set with one mode. - **Bimodal**: A data set with two modes. - **Multimodal**: A data set with multiple modes. - **No mode**: A data set where no number repeats.
