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**What are Bar Charts?**

Bar charts are one of the easiest, graphically attractive and hence most commonly used methods of presenting all types of data. They are especially useful for representing various data series.

The data series comprises the continuous variables while the values of the specific instances at which the value of the data series is measured represent the values of the discrete variables.

Presentation of data as bar charts makes the comparative study of the data very easy. A bar chart consists of a group of bars that are equidistant from each other. The values on the bar charts are read by the measurement of the length or the height of the bars. The width of the bars is largely inessential and is used only for the clarity of the presentation.

Now let's have a look at the different kinds of bar charts and the kinds of data that can be represented on a bar chart.

**Simple Bar Chart**

The simple bar chart is the simplest bar chart that has one continuous variable charted along with one discrete variable. Figure below shows an example of a **Simple Bar Chart**.

Simple Bar Chart

**Composite Bar Chart**

One of the primary limitations of the simple bar chart is that it can only be used to display a single continuous variable. If two or more sets of continuous variables are to be shown on the same bar chart, we use what is called a composite bar chart. Figure below shows an example of the *Composite Bar Chart.*

**The Use of Bar Charts to Show Deviations**

Deviation bars are useful for graphic presentation of continuous variables which can have both positive and negative values, i.e., surplus or deficit, net profit or loss, net of imports and exports. In general continuous variables which have both positive and negative values are best represented on bar charts.

A baseline is created and positive values (such as profit, surplus), etc., are represented by hers above the baseline while negative deviations (loss or deficit) are represented by bars below the baseline as shown in the figure above.

**Representation of Percentage on a Stacked Bar Chart**

Sometimes stacked bars can also be used to represent the break-up of some continuous variable. The figure below will make it clear.

Such use of bar charts is quite convenient for comparing two or more sets of data.

The figure below shows the break-up of the various sources of revenues for the Government of India over a two-year period.

**Examples**

**Ques: Answer the question based on the chart below.**

** Example 1: ****In how many of the given years was the exports at least 10% more than the imports?**

**(A) 0 (B) 1 (C) 2 (D) 3 (E) 4**

**Solution:**

**(a) **In 1994, exports = 80

Imports = 70

10% of imports = (70 x (10/100) = 7)

⇒, Exports > imports + 10% of imports

**(b)** In 1995, exports = 130

Imports = 120

10% of Imports =(120 x (10/100) = 12)

⇒ Exports < imports + 10% of imports

**(c)** In 1996, exports = 140

Imports = 150

⇒ Exports < Imports so we need not consider this case.

**(d)** In 1997, Exports = 112

Imports = 100

10% of Imports = (100 x (10/100) = 10)

⇒ Exports > Imports + 10% of imports(e). In 1998, Exports = 170

Imports = 160

10% of Imports = (160 x (10/100) = 16)

⇒ Exports < Imports + 10% of Imports

**(f)** Exports = 160

Imports = 150

10% of Imports = (150 x (10/100) = 15)

⇒ Exports < Imports + 10% if Imports

⇒The given condition was satisfied in two years.

Choice **(C) **is the correct answer.

**Example 2: ****What were the average exports for the given period (in Rs. 000' crores)?**

**(A) 145 (B) 132 (C) 126 (D) 119 (E) 138**

Thus choice **(B)** is the right answer.

**Example 3: ****From 1995 to 1999, in which year was the percentage growth In exports, when compared to the previous year, the highest?**

**(A) 1995 (B) 1996 (C) 1997 (D) 1998 (E) 1999**

Export in a year exceeded that in the previous year in 1995, I996 and I998. Percentages by which exports in I995, I996 and 1998 exceed the exports in the previous year were:

Only in I995 was the growth more than 60%

Thus choice **(A) **is the correct answer.

**Example 4: ****What is the simple average annual growth rate in the imports from I994 to 1999?**

**(A) 15 (B) 18 (C) 19 (D) 21 (E) 23**

Imports in 1994 (in '000 crores) = 70

Imports in 1999 (in '000 crores) = 150

Thus choice **(E) **is the correct answer.

**Example 5: ****Among the years in which the imports, as well as exports, exceed those in the previous years, In how many years was the percentage increase in imports less than the percentage increase in exports?**

**(A) 0 (B) 1 (C) 2 (D) 3 (E) 4**

The imports, as well as exports, exceeded those in the previous years in I995, I996 and 1998. In none of the years was the given condition satisfied.

Thus choice **(A) **is the correct answer.

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