Cos'è la moda?

Mode is a measure of central tendency, defined as the most frequently occurring value in the data. 

For instance, a sprinter training for a hundred-meter dash, clocks 16.5 seconds most frequently, so 16.5 seconds is the mode.

Data can have one mode, two or more modes, or no mode. If another sprinter clocks 16.2 and 16.5 seconds with equal frequency, the data is said to have two modes, or is bimodal. Datasets with more than two modes are known as multimodal. In contrast, datasets lacking a repeating value have no mode. A good example of this would be a list of prime numbers between one to ten.

The mode is the only statistical tool used for data measured on a nominal scale, which deals with categorical data.

For example, exchange students at a university can be grouped into different categories based on nationality. The most common nationality of the students represents the mode.