NCERT Class 7 Mathematics

DATA HANDLING 57

3.1 INTRODUCTION

In your previous classes, you have dealt with various types of data. You have learnt to
collect data, tabulate and put it in the form of bar graphs. The collection, recording and
presentation of data help us organise our experiences and draw inferences from them.
In this chapter, we will take one more step towards learning how to do this. You will
come across some more kinds of data and graphs. You have seen several kinds of data
through newspapers, magazines, television and other sources. You also know that all
data give us some sort of information. Let us look at some common forms of data that
you come across:

Chapter 3 Data Handling

Temperatures of cities

as on 20.6.2006

Max. Min.

Ahmedabad 38 C29C

Amritsar 37 C26C

Bangalore 28 C21C

Chennai 36 C27C

Delhi 38 C28C

Jaipur 39 C29C

Jammu 41 C26C

Mumbai 32 C27C

Table 3.1

Marks of five students in a Hindi test

of 10 marks are: 4, 5, 8, 6, 7

Table 3.2

Table 3.3

Football

World Cup 2006

Ukraine beat Saudi Arabia by 4 - 0

Spain beat Tunisia by 3 - 1

Switzerland beat Togo by 2 - 0

Data showing weekly absentees

in a class

Monday

Tuesday

Wednesday -

Thursday

Friday

Saturday

represents one child