What is the median of the following set of numbers: 3, 7, 9, 2, 5?

To find the median of a set of numbers, you first need to arrange them in numerical order. When the numbers provided—3, 7, 9, 2, and 5—are sorted, they become 2, 3, 5, 7, and 9.

The median is defined as the middle value of a data set. In this case, there are five numbers, which is an odd quantity. The middle value is simply the third number in this ordered list. Counting to the center, we see that 5 is positioned third.

Therefore, the median of this set is 5, making it the correct choice. Understanding the method of finding the median is crucial, as it helps in various statistical analyses and provides insight into the central tendency of a data set.