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| Class | $0-10$ | $10-20$ | $20-30$ | $30-40$ | $40-50$ | $50-60$ |
| Frequency | $6$ | $f_1$ | $20$ | $15$ | $f_2$ | $4$ |
| Class | $0-10$ | $10-20$ | $20-30$ | $30-40$ | $40-50$ | $50-60$ | $60-70$ | $70-80$ |
| Frequency | $6$ | $8$ | $17$ | $x$ | $42$ | $30$ | $y$ | $8$ |
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