Question
Find the quartile deviation of observations $9,9,9,9,9,9,9$.
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| Weight (kg) | Oct$-15$ | $15-20$ | $20-25$ | $25-30$ | $30-35$ |
| No. of boxes | $8$ | $15$ | $26$ | $47$ | $4$ |
| Standard | 9 | 10 | 11 | 12 |
| No. of students | 65 | 60 | 55 | 50 |