Practise the method.
Optional extension: Frequency density, interpolation and fitted lines
Example 1
| Interval | Frequency density |
|---|---|
| 0 ≤ x < 5 | 4 |
| 5 ≤ x < 20 | 2 |
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Answer:
Example 2
| Interval | Frequency |
|---|---|
| 0 ≤ x < 40 | 12 |
| 40 ≤ x < 46 | 24 |
| 46 ≤ x < 56 | 24 |
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Answer:
Example 3
| Interval | Frequency density |
|---|---|
| 0 ≤ x < 5 | 5 |
| 5 ≤ x < 20 | 4 |
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Answer: