| जीवनकाल (घंटों में) | लैंपों की संख्या |
| $1500-2000$ | $14$ |
| $2000-2500$ | $56$ |
| $2500-3000$ | $60$ |
| $3000-3500$ | $86$ |
| $3500-4000$ | $74$ |
| $4000-4500$ | $62$ |
| $4500-5000$ | $48$ |
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| वर्ग | $0-20$ | $20-40$ | $40-60$ | $60-80$ | $80-100$ |
| बारंबारता | $5$ | $15$ | $20$ | $18$ | $2$ |
| वर्ग | बारंबारता $(f)$ |
|---|---|
| $110-120$ | $6$ |
| $120-130$ | $25$ |
| $130-140$ | $48$ |
| $140-150$ | $72$ |
| $150-160$ | $116$ |
| $160-170$ | $60$ |
| $170-180$ | $38$ |
| $180-190$ | $22$ |
| $190-200$ | $3$ |
| वर्ग अंतराल | बारंबारता |
| $0-10$ | $5$ |
| $10-20$ | $x$ |
| $20-30$ | $20$ |
| $30-40$ | $15$ |
| $40-50$ | $y$ |
| $50-60$ | $5$ |
| कुल | $60$ |
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