Glossary

# Median

Tags: Glossary

A median is described as the number separating the higher half of a sample, population, or probability distribution from the lower half. It is the midpoint of the list of numbers, as opposed to the average.

## What is Median?

A median is a statistical measure that helps us understand the central tendency of a set of numbers. It is often used to find the middle value in a dataset, which can provide valuable insights into the distribution of the data.

To understand the concept of a median, let's consider a simple example. Imagine you have a list of numbers representing the ages of a group of people: 20, 25, 30, 35, and 40. To find the median, you first need to arrange the numbers in ascending order: 20, 25, 30, 35, 40.

Now, since we have an odd number of values, the median is simply the middle number, which in this case is 30. This means that half of the ages in the group are below 30, and the other half are above 30. The median provides us with a clear understanding of the central value in the dataset.

However, what if we have an even number of values? Let's consider another example: 10, 20, 30, and 40. Again, we arrange the numbers in ascending order: 10, 20, 30, 40. Since we have an even number of values this time, there is no single middle number. In this case, we take the average of the two middle numbers to find the median. So, the median would be (20 + 30) / 2 = 25. This means that half of the values are below 25, and the other half are above 25.

It is important to note that the median is different from the average (also known as the mean). While the median represents the middle value, the average is the sum of all the values divided by the total number of values. The median is less affected by extreme values or outliers, making it a useful measure when dealing with skewed datasets.

In summary, the median is a statistical measure that helps us find the middle value in a dataset. It provides insights into the central tendency of the data and is less influenced by extreme values. By understanding the concept of the median, we can gain a deeper understanding of the distribution and characteristics of a set of numbers.