Calculate quartile deviation from the data given below.
| X | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 |
| F | 4 | 6 | 8 | 6 | 4 |
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Calculate quartile deviation from the data given below.
| X | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 |
| F | 4 | 6 | 8 | 6 | 4 |