The mode of a distribution is the value which has the highest probability of occurrence. Distributions can have one or more modes. In practice, we usually encounter distributions with only one mode. In this case, the mode or population mode of a PDF is the measure of a value around which values sampled from a probability distribution tend to lie.

The sample mode is an estimator for the population mode calculated by subdividing the sample range into equal subclasses, counting how many observations fall into each class and selecting the centre point of the class (or classes) with the greatest number of observations.

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