Chapter 12
CLASS IX (NCERT) CHAPTER 12 : STATISTICS 12.1 Introduction Statistics- It is a study of data. Data- Individual pieces of factual information used for analysis. Graph- Diagram of data, which makes understanding easier. It has axes. Here, we are only talking about graphs with two axes, one horizontal axis named as X axes and vertical axes as Y axes. As we studied earlier, data can be represented in the form of tables. Suppose we have a data of score of 20 students in mathematics exam. Marks obtained: 10, 11, 15, 16, 20 No.of students: 6, 2, 4, 5, 3 We will tabulate this as, Mark obtained No. of students (Frequency) 10 6 11 2 15 4 16 5 20 3 After this tabulation, we can do further calcul