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A set of data has no mode when there is no number that occurs more frequently than another. The data set: 1, 2, 5, 5, 6 has a mode of 5. The data set: 1, 2, 3 has no mode.
A set of data will not always have a mode because some data sets will not have a number that occurs more than once.
If no answer is repeated more than other answers in a data set
The mode of a set of data is the most frequent value. Sometimes there is more than 1 most frequent value so there is more than one mode. For example our set is { 1,2,3,4,4,5,6,9} the mode is 4 and here is another set {1,2,3,3,4,5,6,6,7} the modes are 3 and 6 and we say the set is bimodal.
The mode is the most common answers in a data set. Sometimes there can be more than one mode so if there is a single mode it is unique. It there are two it is bimodal.