| $x_i$ | $(x_i - \bar{x})^2$ |
| $3$ | $182.25$ |
| $6$ | $110.25$ |
| $9$ | $56.25$ |
| $12$ | $20.25$ |
| $15$ | $2.25$ |
| $18$ | $2.25$ |
| $21$ | $20.25$ |
| $24$ | $56.25$ |
| $27$ | $110.25$ |
| $30$ | $182.25$ |
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