What is the mode in a data set?

• A. The mean value of a dataset.
• B. The spread of the data.
• C. The value that occurs most often or the most common value in a data set.
• D. The median value of a dataset.

Answer: (C)

The mode is the value that appears most often in a data set. It highlights the most frequent observation, showing the value that occurs with the greatest frequency. For example, in a data set like 3, 7, 3, 2, 9, 3, the value 3 appears more often than any other, so it is the mode. This differs from the mean, which is the average of all values, and from the median, which is the middle value when the data are arranged in order. The mode focuses on frequency rather than balancing values or their position in order. In some data sets there can be more than one mode if multiple values share the highest frequency.