Research Aptitude Steps of Research Data Analysis

What is the formula for the third moment (skewness) of a sample?

1
Σ(xi - x̄)^2 / (n - 1)
2
Σ(xi - x̄)^3 / (n - 1)
3
Σ(xi - x̄)^3 / n
4
Σ(xi - x̄)^2 / n

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