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| $x_i$ | $3$ | $6$ | $9$ | $12$ | $13$ | $15$ | $21$ | $22$ |
| $f_i$ | $3$ | $4$ | $5$ | $2$ | $4$ | $5$ | $4$ | $3$ |
| प्राप्त अंक | $0-20$ | $20-40$ | $40-60$ | $60-80$ | $80-100$ |
| छात्रों की संख्या | $10$ | $8$ | $12$ | $9$ | $11$ |
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