# NCERT Solutions For Class 6 Maths Chapter 9 Exercise 9.4

## Ncert Solutions for Class 6 Maths Chapter 9 Data Handling Exercise 9.4:-

**Exercise 9.4**Class 6 maths NCERT solutions Chapter 9 Data Handling pdf download:-

### Ncert Solution for Class 6 Maths Chapter 9 Data Handling Exercise 9.4 Textbook Solutions:-

**Drawing a bar graph**

Recall the example where Ronald (section 9.3) had prepared a table representing

choice of fruits made by his classmates. Let us draw a bar graph for this data.

Name of fruits Banana Orange Apple Guava

Number of students 8 3 5 4

First of all draw a horizontal

line and a vertical line. On the

horizontal line we will draw bars

representing each fruit and on

vertical line we will write

numerals representing number of

students.

Let us choose a scale. It means

we first decide how many

students will be represented by

unit length of a bar.

Here, we take 1 unit length to

represent 1 student only.

We get a bar graph as shown in

adjoining figure.

Example 10 : Following table shows the monthly expenditure of Imran’s family

on various items.

Items Expenditure (in Rs)

House rent 3000

Food 3400

Education 800

Electricity 400

Transport 600

Miscellaneous 1200

To represent this data in the form of a bar diagram, here are the steps.

(a) Draw two perpendicular lines, one vertical and one horizontal.

(b) Along the horizontal line, mark the ‘items’ and along the vertical line, mark

the corresponding expenditure.

1 unit length = 200 rupees

Items

(c) Take bars of same width keeping uniform gap between them.

(d) Choose suitable scale along the vertical line. Let 1 unit length = Rs 200 and

then mark the corresponding values.

Calculate the heights of the bars for various items as shown below.

House rent : 3000 ÷ 200 = 15 units

Food : 3400 ÷ 200 = 17 units

Education : 800 ÷ 200 = 4 units

Electricity : 400 ÷ 200 = 2 units

Transport : 600 ÷ 200 = 3 units

Miscellaneous : 1200 ÷ 200 = 6 units

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?