| वर्ग | $0-10$ | $10-20$ | $20-30$ | $30-40$ | $40-50$ | $50-60$ | $60-70$ |
| बारंबारता | $4$ | $7$ | $x$ | $18$ | $15$ | $8$ | $7$ |
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| वर्ग | $0-20, 20-40, 40-60, 60-80, 80-100, 100-120$ |
| बारंबारता | $10, f, 7, 6, 5, 4$ |
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