What Are Mean, Median, Mode and Range?
When you have a group of numbers, sometimes you want to understand them better. The four tools we use most often are called the mean, median, mode, and range. Each one tells you something different about your data.
The Mean (The Average)
The mean is what most people call the average. To find it, you add up all the numbers and divide by how many numbers there are. Imagine you scored 8, 9, 7, and 10 marks on four tests. Add them: 8 + 9 + 7 + 10 = 34. Now divide by 4 (the number of tests): 34 ÷ 4 = 8.5. Your mean score is 8.5.
Think of it like sharing sweets equally: if you have 34 sweets and 4 friends, everyone gets 8.5 sweets each.
The Median (The Middle)
The median is the middle number when you arrange your numbers in order. Using the same test scores: 7, 8, 9, 10. The middle two numbers are 8 and 9, so the median is 8.5. If you had five scores, the median would be the third number—the one in the exact middle.
Think of it like standing in a line: the median is the person standing right in the middle.
The Mode (The Most Common)
The mode is simply the number that appears most often. If your test scores were 7, 8, 8, 9, 10, the mode is 8 because it appears twice while the others appear only once. Sometimes there is no mode, or there might be more than one.
Think of it like asking: which flavour of ice cream does everyone pick most often?
The Range (The Spread)
The range shows how spread out your numbers are. To find it, subtract the smallest number from the largest number. With scores of 7, 8, 9, 10, the range is 10 - 7 = 3. This tells you the difference between the best and worst scores.
Think of it like measuring the distance between the tallest and shortest person in your class.
Why Do We Use All Four?
Each one gives you different information. The mean shows the average, the median shows the middle, the mode shows what's most popular, and the range shows how different the numbers are. Together, they help you understand your data much better than just looking at the numbers alone.