Number Play | Class 7 Mathematics Notes

Representation of Data

This section explains how collected data can be represented visually to make it easier to understand and interpret. Data representation involves organizing data in forms such as tables, pictographs, and bar graphs. Tables are used to arrange data systematically in rows and columns. Pictographs use pictures or symbols to represent data, where each symbol corresponds to a certain number of items. Bar graphs use bars of different lengths to represent data values, making it easy to compare quantities visually. The chapter describes the steps involved in creating pictographs and bar graphs, including choosing appropriate scales and labels. It also discusses the importance of titles, labels, and keys in making data representation clear. Through visual representation, patterns and trends in data become more apparent, aiding in better analysis and decision-making. The section includes examples and exercises to practice drawing pictographs and bar graphs from given data.

📊 Diagram: Includes diagrams of tables, pictographs with symbols representing data, and bar graphs with labeled axes and bars of different heights.

🧪 Activity: Activity: Represent the data collected in the previous activity using a pictograph and a bar graph.

🔗 Connection: Leads to the next section on 'Reading Data from Tables and Graphs' where students learn to interpret represented data.