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| वर्ग | आवृत्ति |
| $0 - 20$ | $17$ |
| $20 - 40$ | $f_1$ |
| $40 - 60$ | $32$ |
| $60 - 80$ | $f_2$ |
| $80 - 100$ | $19$ |
| कुल | $120$ |
| $x$ | $2$ | $6$ | $8$ | $9$ |
| $f$ | $4$ | $4$ | $\alpha$ | $\beta$ |
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