| अंक | छात्रों की संख्या |
| $0-20$ | $7$ |
| $20-30$ | $10$ |
| $30-40$ | $10$ |
| $40-50$ | $20$ |
| $50-60$ | $20$ |
| $60-70$ | $15$ |
| $70-100$ | $8$ |
| कुल | $90$ |
| अंक | आवृत्ति | चौड़ाई | आयत की लंबाई |
| $0-20$ | $7$ | $20$ | $\frac{7}{20} \times 10 = 3.5$ |
| $20-30$ | $10$ | $10$ | $\frac{10}{10} \times 10 = 10$ |
| $30-40$ | $10$ | $10$ | $\frac{10}{10} \times 10 = 10$ |
| $40-50$ | $20$ | $10$ | $\frac{20}{10} \times 10 = 20$ |
| $50-60$ | $20$ | $10$ | $\frac{20}{10} \times 10 = 20$ |
| $60-70$ | $15$ | $10$ | $\frac{15}{10} \times 10 = 15$ |
| $70-100$ | $8$ | $30$ | $\frac{8}{30} \times 10 = 2.67$ |
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| समय (घंटों में) | लैंपों की संख्या |
| $300-400$ | $14$ |
| $400-500$ | $56$ |
| $500-600$ | $60$ |
| $600-700$ | $86$ |
| $700-800$ | $74$ |
| $800-900$ | $62$ |
| $900-1000$ | $48$ |
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