What does range measure in a set of scores?

The correct choice highlights that range measures the difference between the highest and lowest scores in a set of data. This statistical measure gives insight into how spread out the scores are, indicating the extent of variability within the dataset. By calculating the range, one can quickly assess whether the scores are tightly clustered together or widely dispersed, which can be vital for understanding the distribution of scores in various contexts, such as performance assessments or standardized tests.

The other choices do not accurately represent what range is. The average would refer to the mean score, the middle score refers to the median, and the most frequently occurring score relates to the mode. Each of these terms describes different aspects of a dataset but does not pertain to the concept of range, which is specifically concerned with the extremes of the data values.