| |
|
|
| |
 |
| Variable |
|
| Quantities such as height, weight, age, amount can have several different values. Quantities which can assume different numerical values are called variables. Variables are of two types: |
| |
| (a) Continuous |
| |
| (b) Discrete. |
| |
|
| |
| Consider an example. A person was asked to measure the thickness of a coin. He recorded the following readings: |
| |
| (i) 0.2 cm with ruler |
| |
| (ii) 0.23 cm with vernier |
| |
| (iii) 0.231 cm with micrometer |
| |
| The accuracy of thickness of the coin depended on the instrument used for measuring the thickness. Thus the thickness of the coin is a continuous variable. Variables like height, weight, time are also called continuous variables. |
| |
|
| |
| Consider an example: The number of pupils in a class can be 30, 34, 40. But it cannot be 30.2, 35.1, because number of pupils can be expressed only as a whole number. Such numerical as number of children, trees, sheep are called discrete variables. |
| |
|
|
| |
|
|
| |
|
|
|
|
|
Get FREE Live Tutoring
(No credit card required)
|
|
|
