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Given \(n\) random variables \(X_1,\dots,X_n\), which expression represents the
sample mean
\(\overline{X}_n\)?
\(X_1 + X_2 + \dots + X_n\)
\(\dfrac{X_1 + X_2 + \dots + X_n}{n}\)
\(n(X_1 + X_2 + \dots + X_n)\)
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