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Question
The time required for some students to complete a science experiment and the number of students is shown in the following grouped frequency distribution table. Draw the frequency polygon with the help of histogram using given information:
| Time required for experiment (minutes) | Number of Students |
| 20 - 22 | 6 |
| 22 - 24 | 14 |
| 24 - 26 | 20 |
| 26 - 28 | 16 |
| 28 - 30 | 12 |
| 30 - 32 | 10 |
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Solution
Consider the following table:
|
Class
(Time required for experiment in minutes)
|
Class mark | Frequency (No.of.students) |
| 20 - 22 | 21 | 6 |
| 22 - 24 | 23 | 14 |
| 24 - 26 | 25 | 20 |
| 26 - 28 | 27 | 16 |
| 28 - 30 | 29 | 12 |
| 30 - 32 | 31 | 10 |
The frequency polygon using the class mark and frequancy given in the above table as
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