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| વર્ગ | $10-20, 20-30, 30-40$ |
| આવૃત્તિ | $2, x, 2$ |
| $x_i$ | $4$ | $8$ | $11$ | $17$ | $20$ | $24$ | $32$ |
| $f_i$ | $3$ | $5$ | $9$ | $5$ | $4$ | $3$ | $1$ |
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