| वर्ग | $20-30$ | $30-40$ | $40-50$ | $50-60$ | $60-70$ | $70-80$ | $80-90$ |
| बारंबारता | $8$ | $12$ | $27$ | $43$ | $55$ | $37$ | $18$ |
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| वर्ग | $30-40$ | $40-50$ | $50-60$ | $60-70$ | $70-80$ |
| आवृत्ति | $3$ | $x$ | $7$ | $7$ | $y$ |
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