The tabular (टेबुलर) representation of data is an ideal way of presenting them in a systematic manner. When these numerical figures are represented pictorially or graphically (ग्राफिकली), they become more noticeable (ध्यान देने योग्य) and easily intelligible, leaving a more lasting effect on the mind of the (प्रेक्षक) observer. With the help of these pictures or graphs (ग्राफ्स), data can be compared easily.
In this chapter, we shall deal with three types of graphs, namely (i) bar graph, (ii) histogram and (iii) frequency polygon.
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