The chapter deals with the concept of a line graph, the concept of a bar graph, the concept of a double bar graph, a pie graph or a circle graph. Bar graphs or bar charts are graphical representations of grouped data in the shape of vertical or horizontal rectangular bars, where the lengths of the bars are proportional to the measure of data.
The bars are all the same width, and the variable amount is shown on one of the axes. On the other axes, the variable's measure is also shown. The heights or lengths of the bars represent the variable's value, and these graphs may also be used to compare two or more values. Bar charts may be used to depict frequency distribution tables, making computations and interpreting data easier. The three main characteristics of bar graphs are:
A double bar graph is used to represent two data simultaneously in a single graph. This graph is mostly used for data comparison.
Further, Maths Chapter 27 Introduction to Graphs Solutions includes drawing a double bar graph, graphical representation of data as histograms, interpretation of double bar graph, interpretation of bar graph, linear graphs, applications of linear graphs.