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| $x_i$ | $4$ | $3$ | $1$ |
| $f_i$ | $1$ | $3$ | $5$ |
| वर्ग | $10-20, 20-30, 30-40$ |
| बारंबारता | $2, x, 2$ |
| $X$ | $5$ | $6$ | $7$ | $8$ | $10$ |
| आवृत्ति | $3$ | $7$ | $4$ | $2$ | $4$ |
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