GRAPHICAL REPRESENTATION OF DATA
Graphical Representation of Data
Any collection of information in the form of numerical figures giving the required information is called Data.
In olden days, primitive man used to count and verify his livestock using stones. This is the first data gathering method. Nowadays we use many methods to collect information the most efficient method is to keep a "tally stick".
Example 1
An information was collected about the number of vehicles which crossed a school on a particular time.
‘1’ is called a ‘tally mark’. It is difficult to count if there are more number of tally marks. Therefore to make it easier to count, we change it as follows.
Note: We can use tallymark to record data with large numbers.
Solution
Answer the following questions:
1. Which vehicle crossed the school maximum in numbers?
Answer: lorry2. Find the total number of vehicles which crossed on a particular time?
Answer: 47Example 2
Information was collected by Balu from 20 students of class five regarding their favourite snacks. Tabulate the given information.
Tabulate the above information by using Tallymark. Here, all the students have chosen any one of the snacks we can tabulate it as follows.
Activity 1
The number of two-wheelers sold during a week in a show room is given below. Represent the data using tally marks.
Sunday – 6
Monday −11
Tuesday −3
Wednesday −5
Thusday −16
Friday −16
Saturday −4
Activity 2
In a mathematics test, the following marks were obtained by 30 students. Arrange these marks in a table using tally marks.
(a) Find how many students obtained marks equal to or more than 8? 6
(b) How many students obtained marks below 4? 9
Try this
Ask the students to collect the information about the number of students present in a particular day of the school. Tabulate the above information using tally marks.
Do it yourself
Ask the students to collect information about the different types of houses in their villages and complete the following table.
Try yourself
Choose any five cities and record their temperature from the TV (or) Newspaper.
Chennai 35. 6 \(^0\)C
Tenkasi 30\(^0\) C
Kodaikanal 22\(^0\) C
Madurai 41.4\(^0\) C
Coimbatore 38.2\(^0\)
Kanyakumari 32.80\(^0\) C
Try this
Collect information based on the points given below and prepare a table using tally marks
(a) Which story book do your classmates like?
Clue [Fairy tales, Moral stories, Comics, picture stories, fictions and animal stories]
(b) What do your classmates want to become when they grow up?
Clue [Doctor, Farmer, Engineer, Pilot, Politician, Teacher]
