NCERT Book Class 8 Maths Chapter 4 Data Handling

DATA HANDLING 37

CHAPTER

Data Handling
4
4.1 Looking for Information
In your day-to-day life, you might have come across information, such as:
(a) Runs made by a batsman in the last 10 test matches.
(b) Number of wickets taken by a bowler in the last 10 ODIs.
(c) Marks scored by the students of your class in the Mathematics unit test.
(d) Number of story books read by each of your friends etc.
The information collected in all such cases is called data. Data is usually collected in
the context of a situation that we want to study. For example, a teacher may like to know
the average height of students in her class. To find this, she will write the heights of all the
students in her class, organise the data in a systematic manner and then interpret it
accordingly.
Sometimes, data is represented graphically to give a clear idea of what it represents.
Do you remember the different types of graphs which we have learnt in earlier classes?
1. A Pictograph: Pictorial representation of data using symbols.

= 100 cars ← One symbol stands for 100 cars

1
July = 250 denotes of 100
2

August = 300

September =?

(i) How many cars were produced in the month of July?
(ii) In which month were maximum number of cars produced?
2. A bar graph: A display of information using bars of uniform width, their heights being proportional to
the respective values.