| वर्ग अंतराल ($C$.$I$.) | $0$ - $6$ | $6$ - $12$ | $12$ - $18$ |
| बारंबारता (f_i) | $2$ | $4$ | $6$ |
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| $x_i$ | $4$ | $3$ | $1$ |
| $f_i$ | $1$ | $3$ | $5$ |
| वर्ग अंतराल | $0-10$ | $10-20$ | $20-30$ | $30-40$ |
| बारंबारता | $1$ | $3$ | $4$ | $2$ |
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