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You are Given sample: n-1 observations Let the average be: Xn-1. Now assume nth observation is added, value Xn New average is xn Prove

You are Given sample: n-1 observations Let the average be: Xn-1. Now assume nth observation is added, value Xn New average is xn Prove that: xn Xn-1 [xn-Xn-1. n

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