1. Arithmetic mean

INTRODUCTION 
    In this chapter we will learn
    1.    Various forms of data        
    2.    Organization of data
    3.    Useful forms of data representation.
    Data: Information presented in the form of numerical figures. For example:
    “Rajesh has 15 books” is a data whereas nearly saying that         
    “Rajesh has large number of  books” is not a data.
    

•          Raw Data: Data as obtained from the source, generally in unarranged form.

Chapter 3

Data handling

Arithmetic mean

Data handling may be as simple as drawing on a sheet of paper or the completion of entry forms on a computer screen. Data is a collection of numbers gathered to give some information
For eg the marks of students in the class or the amount of various goods shopped from the market.