# Graphical Representation

**Bar graph:**

It is a pictorial representation of the numerical data by a number of bars (rectangles) of uniform width erected horizontally or vertically with equal spacing between them.

The bar graph shows Divya's performance in the Quarterly, Half yearly and annual examinations.

It helps us to compare whole years' performance. From the above graph we infer that Divya's total marks has been increasing which shows progress in studies.

Bar graph can also have double bars. This graph gives a comparative account of sales of various crackers over a two-day period.

From the above graphs, first graph shows the comparison of three examination of a student. Second graphs shows that four variety of crackers sales in two days.

**Pie graph (or a circle-graph):**

It is used to compare parts of a whole. The circle represents the whole is a pie-graph.

In the month of December 2008, Ramu spends his monthly salary amounting to Rs. 7,200 in different items as given below.

**Histogram:**

A histogram is a graphical representation of a frequency distribution in the form of rectangles with class intervals as bases and heights proportional to corresponding frequencies such that there is no gap between any two successive rectangles.

The following table gives the marks scored by 100 students in an Entrance Examination.

Mark |
10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 | 80-90 |

Number of students (frequency) |
4 | 10 | 16 | 22 | 20 | 18 | 8 | 2 |