International Board of Certified Lactation Consultant (IBCLC) Practice Exam

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What is the median of the following numbers: 1, 2, 2, 5?

The correct answer is: 2.5

To determine the median of a set of numbers, you first need to arrange the numbers in order and then identify the middle value. In the case of an even number of values, such as the set here which contains four numbers (1, 2, 2, 5), the median is calculated by taking the average of the two middle numbers. When the numbers are organized in ascending order, they are already arranged as: 1, 2, 2, 5. The two middle numbers in this ordered set are the second and third values, which are both 2. To find the median, you take the average of these two values: (2 + 2) / 2 = 4 / 2 = 2. Thus, the median of this set of numbers is correctly determined as 2. The choice of 2.5 represents an incorrect average of different values or an error in identifying the middle elements in this specific ordered set.