Postsecondary Education Readiness Test (PERT) Practice Test

The mean refers to the average of a set of numbers, which is calculated by adding all the numbers together and then dividing the sum by the count of the numbers in the set. This statistic provides a central value for that dataset, making it a fundamental concept in statistics. The mean is particularly useful because it takes into account every value in the set, giving it a comprehensive representation of the data. In contrast, the median is the middle number in a sorted list of values, which can be influenced by the presence of outliers if the numbers are not evenly distributed. The mode is the value that appears most frequently in a dataset, which may not provide any insight into the overall average if the values are distributed unevenly. The range, on the other hand, measures the difference between the highest and lowest values in the dataset, indicating how spread out the numbers are but not offering an average. Thus, the mean is the appropriate term for the concept of finding the average of a set of numbers.