23. Suppose (X1,..., Xn} are random variables on the probability space (S, B, P) such that P[ Ties]:= P{ [X₁ = X₁]} = 0. i#j 1≤i, j≤n Define the relative rank Rn of Xn among (X1, ..., Xn} to be Ei=11[X₁2X] Rn = 17, Prove Rn is a random variable. on [ Ties ]º, on [Ties].

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A: It is an important part of statistics. It is widely used.

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