| वर्ग | $30-40$ | $40-50$ | $50-60$ | $60-70$ | $70-80$ | $80-90$ | $90-100$ |
| बारंबारता $({f_i})$ | $3$ | $7$ | $12$ | $15$ | $8$ | $3$ | $2$ |
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| $X$ | $c$ | $2c$ | $3c$ | $4c$ | $5c$ | $6c$ |
| $f$ | $2$ | $1$ | $1$ | $1$ | $1$ | $1$ |
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