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| वर्ग | $0-20$ | $20-40$ | $40-60$ | $60-80$ | $80-100$ |
| $f$ | $17$ | $f_1$ | $32$ | $f_2$ | $19$ |
| $X_i$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ |
| आवृत्ति $f_i$ | $3$ | $6$ | $16$ | $\alpha$ | $9$ | $5$ | $6$ |
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