## Ncert Solutions for Class 6 Maths Chapter 9 Data Handling Exercise 9.3:-

**Exercise 9.3**Ā Class 6 maths NCERT solutions Chapter 9 Data Handling pdf download:-

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### Ncert Solution for Class 6 Maths Chapter 9 Data Handling Exercise 9.3 Tips:-

Drawing a Pictograph

Drawing a pictograph is interesting. But sometimes, a symbol like (which

was used in one of the previous examples) may represent multiple units and

may be difficult to draw. Instead of it we can use simpler symbols. If represents

say 5 students, how will you represent, say, 4 or 3 students?

We can solve such a situation by making an assumption that ā

represents 5 students, represents 4 students,

represents 3 students, represents 2 students, represents 1 student, and

then start the task of representation.

A Bar Graph

Representing data by pictograph is not only time consuming but at times difficult

too. Let us see some other way of representing data visually. Bars of uniform

width can be drawn horizontally or vertically with equal spacing between them

and then the length of each bar represents the given number. Such method of

representing data is called a bar diagram or a bar graph.

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Let represent 10 bulbs.

January

February

March

April

100

200

300

400

500

600

700

800

900

1000

1100

1200

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6-7

7-8

8-9

9-10

10-11

11-12

Time intervals

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The scale is 1 unit length equal to 100

vehicles.

i.e. 1 unit length = 100 vehicles

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Number of vehicles

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We can see that maximum traffic is shown by the longest bar (i.e. 1200

vehicles) for the time interval 7-8 a.m. The second longer bar is for 8-9 a.m.

Similarly, minimum traffic is shown by the smallest bar (i.e. 100 vehicles) for

the time interval 6-7 a.m. The bar just longer than the smallest bar is between

11 a.m. – 12 noon.

The total traffic during

the two peak hours

(8.00-10.00 am) as shown

by the two long bars is

1000+900 = 1900 vehicles.

If the numbers in the

data are large, then you may

need a different scale.

For example, take the case

of the growth of the

population of India. The

numbers are in crores. So,

if you take 1 unit length to

9.7.1 Interpretation of a bar graph

Let us look at the example of vehicular traffic at a busy road crossing in Delhi,

which was studied by the traffic police on a particular day. The number of vehicles

passing through the crossing every hour from 6 a.m. to 12.00 noon is shown in

the bar graph. One unit of length stands for 100 vehicles.