# Data Handling - NCERT Class 7 Maths

The chapter 3 begins with an introduction to Data Handling by recollecting the concepts of Collecting Data and Organisation of Data. Then the concept of representative value is presented and the concept of Arithmetic mean is introduced.The formula to calculate the arithmetic mean is explained using some real life examples.Then the concept of Range is introduced.Now, the other two measures of central tendency namely the Mode and Median are introduced.Under Mode, the Mode of large data is introduced. Similarly, the representation of data using Median is discussed in detail.The next section of the chapter deals with graphical representation of data by the use of Bar Graphs with a different purpose.Finally, the concepts of Chance and Probability are introduced in the last section of the chapter.