Representation of Data
A cupboard has five compartments. In each compartment a row of books is arranged.
The details are indicated in the adjoining table :
| Rows | Number of Books | Count |
|---|---|---|
| Row 1 |  | |
| Row 2 | | |
| Row 3 | | |
| Row 4 | | |
| Row 5 | |
Which row has the greatest number of books?
Which row has the least number of books?
Is there any row which does not have books?
You can answer these questions by just studying the diagram. The picture visually helps you to understand the data. It is a pictograph.
A pictograph represents data through pictures of objects. It helps answer the questions on the data at a glance.
The following pictograph shows the number of absentees in a class of 30 students during the previous week.
| Days | Number of students | Absentee |
|---|---|---|
| Monday |  | |
| Tuesday | | |
| Wednesday | | |
| Thursday | ||
| Friday | | |
| Saturday | |
(a) On which day were the maximum number of students absent?
(b) Which day had full attendance?
(c) What was the total number of absentees in that week?
The colours of fridges preferred by people living in a locality are shown by the following pictograph.
= 10 people Note:
=
| Colours | Number of people | Count |
|---|---|---|
| Blue | | |
| Green | | |
| Red | | |
| Purple | |
(a) Find the number of people preferring blue colour?
(b) How many people liked red colour?
A survey was carried out on 30 students of class VI in a school. Data about the different modes of transport used by them to travel to school was displayed as pictograph.
What can you conclude from the pictograph?
| Modes of travelling | Number of students | Count |
|---|---|---|
| Private car |  | |
| Public bus |  | |
| School bus |  | |
| Cycle |  | |
| Walking |  |
From the pictograph we find that:
(a) The number of students coming by private car:
(b) Maximum number of students use:
This is the
(c) Cycle is used by:
(d) The number of students using the other modes can be similarly found.
Following is the pictograph of the number of wrist watches manufactured by a factory in a particular week.
| Days | Number of wrist watches manufactured | Count |  - 100 Wrist Watches |
|---|---|---|---|
| Monday | | ||
| Tuesday |  | ||
| Wednesday | | ||
| Thursday | | ||
| Friday | | ||
| Saturday | |
(a) On which day were the least number of wrist watches manufactured?
(b) On which day were the maximum number of wrist watches manufactured?
(c) Find out the approximate number of wrist watches manufactured in the particular week?
Which form of graph would be appropriate to display the following data.
- Production of food grains of a state:
| Year | Production(in lakh tons) |
|---|---|
| 2001 | 60 |
| 2002 | 50 |
| 2003 | 70 |
| 2004 | 55 |
| 2005 | 80 |
| 2006 | 85 |
Construction of a Bar Graph
The professtons of people living in a colony are given in the following Table.
| Profession | Framers | Businessmen | Private Employee | Govt Employee | Labours |
|---|---|---|---|---|---|
| No.of Persons | 10 | 20 | 30 | 40 | 50 |
To represent the above data in the form of a Vertical bar diagram:
To represent the above data in the form of a Horizontal bar diagram: