Statistics Definitions > Mode

**Contents**:

## What is the Mode?

The mode, or modal value, is the most common number in a data set. It’s useful in statistics because it can tell you what the most popular item in your set is. For example, you might have results from a customer survey where your company is rated from 1 to 5. If the most popular answer is 2, then you know you need to make some improvements in customer service!

A data set can have no mode, one, or many:

- None: 1, 2, 3, 4, 6, 8, 9.
- One mode:
**unimodal**: 1, 2, 3, 3, 4, 5. - Two:
**bimodal**: 1, 1, 2, 3, 4, 4, 5. - Three:
**trimodal**: 1, 1, 2, 3, 3, 4, 5, 5. - More than one (two, three or more) =
**multimodal**.

## Histograms and Modes

A histogram shows frequencies of values. In other words, how often a value appears in a data set. Look for the “bump” in the histogram. In the histogram below, the bump is at 4:

In real life, you’l rarely (if ever) see a histogram with single digit numbers on the x-axis. You’ll see bars that are groups of numbers. For example a bar might represent 10 to 20, or it might represent 30-40. The technique is still the same — look for the “bump” in the histogram. With histograms that have bars with groups of numbers, you’ll have to ballpark where exactly the number is. The easiest way to do it is to take the number to the left and right of the highest bar and figure out where the middle is.

## Fun Fact

A relationship between the mode, mean and median for unimodal distribution curves that are moderately asymmetry is given by this equation:

Mean – mod ≈ 3(mean – median).

## Find by hand

Watch the video or read the article below:

The **mode** in statistics is the most common number in a data set. For example, in this set it’s 2, because it is the number that occurs most often: 1,2,2,5,6. Data sets in statistics tend to be much larger, so the mode is easier to spot if you put the numbers in order.

## Find the Mode: Steps

**Sample question: **Find the mode for the following data set:

56, 57, 56, 58, 59, 90, 98, 98, 65, 45, 34, 34, 23, 23, 24, 33, 56, 67, 78, 87, 87, 56.

Step 1: **Put the numbers in order**:

23 23 24 33 34 34 45 56 56 56 56 57 58 59 65 67 78 87 87 90 98 98

Step 2: **Count how many times each number appears**. This may be easier if you put the numbers in a column/row format like this:

23 23

24

33

34 34

45

56 56 56 56

57

58

59

65

67

78

87 87

90

98 98

The most common number is **56** in this data set (it appears 4 times).

Microsoft Excel

If you have a large number of items in your data set, Excel has a “Sort” button on the toolbar that will sort numbers from smallest to largest or largest to smallest. Type your numbers into a single column in Excel. Click “Home,” then click “Sort and Filter” and then click “A to Z” to sort from smallest to largest or “Z to A” to sort from largest to smallest.

**Next**: Mode in Minitab

If you prefer an online interactive environment to learn R and statistics, this *free R Tutorial by Datacamp* is a great way to get started. If you're are somewhat comfortable with R and are interested in going deeper into Statistics, try *this Statistics with R track*.

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In figure 1, you have mentioned bump at 5, but i am getting confused that is it bump at 4 or not.

That was a typo. It’s now fixed — the bump is at 4. Thanks for spotting that. Yagya!