Preliminary SAT (PSAT) Practice Test

To determine the median of a data set with an even number of terms, the correct method involves calculating the average of the two middle numbers. When the data set is arranged in ascending order, the middle values are found by identifying the two central numbers. Since there are an even number of entries, there is no single middle number. Instead, these two middle numbers need to be added together, and then divided by two to yield the average, which represents the median of that data set. This approach ensures that the median accurately reflects the middle point of the data distribution, providing a central value that separates the higher half from the lower half of the data set.