Class 6 Maths Data Handling Introduction

Introduction

Data is a collection of numbers gathered to give some information.  To get particular information from the given data quickly, the data has to be organized first.

The organization of data can be done in various ways. One way to organize data is by using tally marks. Tally marks are a way of expressing numbers in groups of 5. The numbers are represented as follows:

Another way of organizing data is through the use of pictographs. A pictograph represents data through pictures of objects. It helps answer the questions on the data at a glance. For e.g. the following table shows the no of apples sold by a vendor during a week:

Maximum number of apples were sold on Monday that is, 50 apples since there are 5 pictures. On Wednesday, no apples were sold as there is no picture.

The following examples illustrate the use of above methods:

 

Problem: Following is the choice of sweets of 30 students of Class VI.

Ladoo, Barfi, Ladoo, Jalebi, Ladoo, Rasgulla, Jalebi, Ladoo, Barfi, Rasgulla, Ladoo, Jalebi, Jalebi, Rasgulla, Ladoo, Rasgulla, Jalebi, Ladoo, Rasgulla, Ladoo, Ladoo, Barfi, Rasgulla, Rasgulla, Jalebi, Rasgulla, Ladoo, Rasgulla, Jalebi, Ladoo.

  • Arrange the names of sweets in a table using tally marks.
  • Which sweet is preferred by most of the students?

Ladoo is most preferred by people as 11 people prefer it.

 

Problem: The number of girl students in each class of a co-educational middle school is depicted by the pictograph:

Observe this pictograph and answer the following questions:

(a) Which class has the minimum number of girl students?

(b) Is the number of girls in Class VI less than the number of girls in Class V?

(c) How many girls are there in Class VII?

 

Solution:

Class 8 has minimum number of girls. It has more than 4 but less than 8 girls.

No, class 6 has 16 girls (4*4) while class 5 has less than 16.

Class 7 is represented by 3 pictures. Thus, it has 3*4 = 12 girls.

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