varPop doc latex formula added

- There is a latex formula in the documentation of the [covarPop](https://clickhouse.com/docs/en/sql-reference/aggregate-functions/reference/covarpop) method, which is quite similar to varPop method.

- In Russian docs there are formulas both for [varPop](https://clickhouse.com/docs/ru/sql-reference/aggregate-functions/reference/varpop), and [covarPop](https://clickhouse.com/docs/ru/sql-reference/aggregate-functions/reference/covarpop).

Therefore, for consistency, it is suggested to add formula here too.
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Zaynulla 2024-11-23 15:52:48 +03:00 committed by GitHub
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## varPop
Calculates the population variance.
Calculates the population variance:
$$
\frac{\Sigma{(x - \bar{x})^2}}{n}
$$
**Syntax**