- Mean, Median, and Mode
- Home
- Mode of a Data Set
- Finding the Mode and Range of a Data Set
- Finding the Mode and Range from a Line Plot
- Mean of a Data Set
- Understanding the Mean Graphically: Two bars
- Understanding the Mean Graphically: Four or more bars
- Finding the Mean of a Symmetric Distribution
- Computations Involving the Mean, Sample Size, and Sum of a Data Set
- Finding the Value for a New Score that will yield a Given Mean
- Mean and Median of a Data Set
- How Changing a Value Affects the Mean and Median
- Finding Outliers in a Data Set
- Choosing the Best Measure to Describe Data

- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who

# Understanding the Mean Graphically: Two bars

In this lesson we understand the mean of a dataset using graphical method.

Suppose we are given a bar graph showing two bars of data. Here we are required to find the mean of given data graphically.

## Rules to find the mean graphically

In the bar graph we find the heights of the two bars.

The average or mean of these heights is found.

We then draw a third bar with the average height found in second step.

The height of this third bar gives the mean or average of given data set graphically.

The two bars in a bar graph have heights 16 and 22. What height a new bar should have so that it has the mean height of the two bars?

### Solution

**Step 1:**

Heights of given bars 16, 22

**Step 2:**

Mean height = $\frac{(16 + 22)}{2} = \frac{38}{2}$ = 19

So height of new bar = 19

The two bars in a bar graph have heights 15 and 27. What height a new bar should have so that it has the mean height of the two bars?

### Solution

**Step 1:**

Heights of given bars 15, 27

**Step 2:**

Mean height = $\frac{(15 + 27)}{2} = \frac{42}{2}$ = 21

So height of new bar = 21