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| वर्ग अंतराल | आवृत्ति |
|---|---|
| $0 - 6$ | $10$ |
| $6 - 12$ | $8$ |
| $12 - 18$ | $6$ |
| $18 - 24$ | $4$ |
| $24 - 30$ | $2$ |
| $x_i$ | $60$ | $61$ | $62$ | $63$ | $64$ | $65$ | $66$ | $67$ | $68$ |
| $f_i$ | $2$ | $1$ | $12$ | $29$ | $25$ | $12$ | $10$ | $4$ | $5$ |
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