If you have a set of individual observations, the mode is the observation that occurs the most often.
However, with very large sets, you may wish to group the data into classes. In that case, the class with the largest frequency is the modal class.
The modal class need not contain the mode. Also, the modal class depends on how the classes are defined.
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It is quite possible for there to be no mode. A sample from a continuous distribution may have a modal class but is very unlikely to have a mode.
There are two modes! that is one of the main weaknesses of the mode as a measure of central tendency.
There is no modal value.
The mode is the only one of these measure which can be used with qualitative data: the mean or median are impossible to compute. Also, for a data set consisting of a relatively small number of observations of a discrete variable the mode or modal class is the easiest to find.
A single number, such as 3456, has only one mode and that is itself.