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* Transformation: Added variance and standard deviation for sample and population. Modified mean calculation approach * Transformation: Removed existing mean calculation * Transformation: Added testcases for variance and Standard deviation * Update docs/sources/panels/calculation-types.md Co-authored-by: brendamuir <100768211+brendamuir@users.noreply.github.com> Co-authored-by: brendamuir <100768211+brendamuir@users.noreply.github.com>