We will learn how to present data in a bar graph. A bar chart is an easy way to present data. The bar chart is a method of representing data by drawing rectangular bars of the same width and spacing between the two bars. Bar charts can be drawn with horizontal or vertical bars.

A bar chart needs to be drawn on a chart sheet. A bar graph must have a tittle above the bar graph.

The information in a bar graph is presented along the horizontal and vertical axes. The horizontal axis generally represents the periods or intervals and the vertical axis represents the amount.

Each axis has a label. The label shows the information displayed on each axis. The bars can be shaded or colored accordingly. A suitable scale is selected to decide the width of the bars and to mark the numbers or values on the vertical axis.

We have seen how the pictogram represents an information pattern through numerical data in general. However, such a representation takes a long time, and sometimes drawing icons makes it difficult to work. Therefore, instead of using icons, it is easier to use bars of equal width (rectangles) to represent the number of buses.

Take a look at the following bar graph representation.

Such a representation of data with the help of bars is called a bar chart. The bars can be shaded or colored.

**Types of bar charts**

There are two types of bar graphs:

(i) Horizontal bar graph (ii) Vertical bar graph

**Horizontal bar graph**

Let’s consider an example:

Draw a horizontal bar graph based on the following data.

Solution:

The bar chart gives us the following information.

(i) The number of students who passed in various subjects.

(ii) The maximum number of students who have passed in music.

(iii) The minimum number of students who have passed in English and Math.

(iv) The student did best in music and worst in English and math.

**Vertical bar graph**

Let’s take a few examples.

**1.** Draw a vertical bar graph based on the following data.

**Solution:**

The graphic gives us the following information.

(i) The number of different brands of television sets manufactured on a given day.

(ii) Sony TV production was at its maximum that day.

(iii) Prince television production that day was minimal.

We can say that a bar graph is a pictorial representation of the numerical data by a number of bars (rectangles) of the same width drawn horizontally or vertically with the same spacing between them.

**2.** Take a look at the bar graph given below. What information does the bar chart show?

The bar chart here shows the number of seedlings planted by students in grades 1 to 5. The title of the bar chart of the planted seedlings. The scale used here is 1 square = 10 seedlings.

Now watch the bar graph above and answer the following questions.

(i) How many seedlings were planted in total?

50 + 60 + 40 + 90 + 50 = 290

(ii) Write the scale of the bar graph above.

1 square = 10 seedlings

(iii) Which two classes have planted the same number of seedlings?

Class I and Class V.

(iv) Two reasons why we should grow plants ____________________

**4th grade math activities**

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