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Question
Draw histogram for the following frequency distributions:
| Class Interval | 0 – 10 | 10 – 20 | 20 – 30 | 30 – 40 | 40 – 50 | 50 – 60 |
| Frequency | 12 | 20 | 26 | 18 | 10 | 6 |
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Solution
| Class Interval | Frequency |
| 0 – 10 | 12 |
| 10 – 20 | 20 |
| 20 – 30 | 26 |
| 30 – 40 | 18 |
| 40 – 50 | 10 |
| 50 – 60 | 06 |
Steps of construction:
- Taking suitable scales, mark class intervals on x-axis and frequency on y-axis.
- Construct rectangles with class intervals as bases and corresponding frequencies as heights.
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Try yourself
- Next time when you watch your favourite TV programme, count the number of advertisements during each break. Use tally marks. Put a dot below the tally when you find children in any advertisement.
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After reading the data for a histogram, what should be checked next?
After converting inclusive classes in a histogram, what is calculated next?
