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?
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