Mode
a third measure of location is the mode.The mode is defined as follows.
Mode
the mode is the value that occurs with greatest frequency
To illustrate the identification of the mode, consider the simple of five class sizes.The only value that occurs more than once is 46.Because this value, occurring with a frequency of 2, has the greatest frequency, it is the mode.As another illustration, consider the simple of starting salaries for the business school graduates.The only monthly starting salary that occurs more than once is $3480. Because this value has the greatest frequency. it is the mode.
Situations can arise for which the greatest frequency occurs at two or more different values.In these instances more than one mode exists.If data contain exactly two modes, we say that the data are bimodal. If data contain more than two modes,we say that the data are multimodal. In multimodal cases the mode is almost never reported because listing three or more modes would not be particularly helpful in describing a location for the data.