Practise the method.
Optional extension: Unknown frequencies, grouped estimates and weighted spread
Example 1
| Value | Frequency |
|---|---|
| 3 | 6 |
| 5 | x |
| 8 | 7 |
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Answer:
Example 2
| Interval | Frequency |
|---|---|
| 4 ≤ x < 12 | 4 |
| 12 ≤ x < 20 | 2 |
| 20 ≤ x < 28 | 5 |
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Answer:
Example 3
| Value | Frequency |
|---|---|
| 6 | 6 |
| 8 | x |
| 11 | 7 |
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Answer: