RS Aggarwal Solutions for Class 7 Chapter 21 Collection and Organisation of Data, Organization of data refers to the systematic arrangement of collected figures (raw data) so that the data becomes easy to understand and more convenient for further statistical treatment. Collection and Organisation of Data (Mean, Median and Mode) is a topic in Arithmetic which is a branch of Mathematics. In this chapter, students are going to learn about mean, median and mode. These are all the concepts to measure the central tendency of the given data. This data may be related to the profits of a company during the last few years, the monthly wages earned by workers in a factory, the marks obtained by the students of a class 7 in a particular examination etc.