Which of the following represents the most frequent number in a data set?

The most frequent number in a data set is referred to as the mode. In statistics, the mode is the value that appears most often in a given set of numbers. For example, in the data set {1, 3, 3, 6, 7}, the number '3' is the mode because it occurs more frequently than any other number.

Understanding the mode is important because it provides insight into the most common values within a data set, which can be useful in various analyses, such as identifying trends and making decisions based on frequently occurring data points.

In contrast, the median is the middle number when a data set is ordered from least to greatest, while the mean is the average of all the numbers. The range simply describes the difference between the highest and lowest values in the data set. Each of these measures serves a different purpose in data analysis, but the mode specifically addresses frequency, making it the correct choice for identifying the most frequent number.