Organisation of Data
To get the same information which Salma got, Ronald needs only a pen and a paper. He does not need pebbles. He also does not ask students to come and place the pebbles. He prepares the following table.
| Fruit | Mark | Count |
|---|---|---|
| Banana | ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ | |
| Orange | ✓ ✓ ✓ | |
| Apple | ✓ ✓ ✓ ✓ ✓ | |
| Guava | ✓ ✓ ✓ ✓ |
Do you understand Ronald’s table?
What does one (✓) mark indicate?
One (✓) mark denotes
How many (✓) marks are there against guava?
How many students were there in the class?
Discuss about these methods. Which is the best?
Which method is more useful when information from a much larger data is required?
A teacher wants to know the choice of food of each student as part of the mid-day meal programme. The teacher assigns the task of collecting this information to Maria. Maria does so using a paper and a pencil. After arranging the choices in a column, she puts against a choice of food one (|) mark for every student making that choice.
| Choice | Number of students |
|---|---|
| Rice only | ||||||||||||||||| |
| Chapati only | ||||||||||||| |
| Both rice and chapati | |||||||||||||||||||| |
Let's see step by step solution!
Umesh, after seeing the table suggested a better method to count the students.
He asked Maria to organise the marks (|) in a group of ten.
| Choice | Number of students | Tally Marks |
|---|---|---|
| Rice only | ||
| Chapati only | ||
| Both rice and chapati |
Rajan made it simpler by asking her to make groups of five instead of ten using the mark ( | ).
| Choice | Number of students | Tally Marks |
|---|---|---|
| Rice only | ||
| Chapati only | ||
| Both rice and chapati |
Teacher suggested that the fifth mark in a group of five marks should be used as a cross, as shown . These are tally marks. Thus, shows the count to be five plus two (i.e. seven) and shows five plus five (i.e. ten).
| Choice | Number of students | Tally Marks |
|---|---|---|
| Rice only | ||
| Chapati only | ||
| Both rice and chapati |
1. Collect information regarding the number of family members of your classmates and represent it in the form of a table. Find to which category most students belong.
| Number of family members | Tally marks | Number of students with that many family members |
|---|---|---|
Make a table and enter the data using tally marks. Find the number that appeared:
(a) The minimum number of times?
(b) The maximum number of times?
(c) Same number of times?