| $x_i$ | $3$ | $6$ | $9$ | $12$ | $13$ | $15$ | $21$ | $22$ |
| $f_i$ | $3$ | $4$ | $5$ | $2$ | $4$ | $5$ | $4$ | $3$ |
| $x_i$ | $3$ | $6$ | $9$ | $12$ | $13$ | $15$ | $21$ | $22$ |
| $f_i$ | $3$ | $4$ | $5$ | $2$ | $4$ | $5$ | $4$ | $3$ |
| $c.f.$ | $3$ | $7$ | $12$ | $14$ | $18$ | $23$ | $27$ | $30$ |
| $|x_i - M|$ | $10$ | $7$ | $4$ | $1$ | $0$ | $2$ | $8$ | $9$ |
| $f_i$ | $3$ | $4$ | $5$ | $2$ | $4$ | $5$ | $4$ | $3$ |
| $f_i|x_i - M|$ | $30$ | $28$ | $20$ | $2$ | $0$ | $10$ | $32$ | $27$ |
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