Mathematics
Construct a frequency polygon for the following distribution :
| Class-intervals | 0 - 4 | 4 - 8 | 8 - 12 | 12 - 16 | 16 - 20 | 20 - 24 |
|---|---|---|---|---|---|---|
| Frequency | 4 | 7 | 10 | 15 | 11 | 6 |
Statistics
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Answer
| Class intervals | Frequency | Class mark |
|---|---|---|
| -4 - 0 | 0 | |
| 0 - 4 | 4 | |
| 4 - 8 | 7 | |
| 8 - 12 | 12 | |
| 12 - 16 | 15 | |
| 16 - 20 | 11 | |
| 20 - 24 | 6 | |
| 24 - 28 | 0 |
Steps:
Find the class-mark (mid-value) of each given class-interval.
Class-mark = mid-value =
On a graph paper, mark class-marks along x-axis and frequencies along y-axis.
On this graph paper, mark points taking values of class-marks along x-axis and the values of their corresponding frequencies along y-axis.
Draw line segments joining the consecutive points marked in step (3) above.
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