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Q1. as usual, I tried to take the expectation to see if this is biased or...

Q1. as usual, I tried to take the expectation to see if this is biased or not E(@^2c) but I got stuck and all the solution skip so many steps so i cant understand. I have no idea how I do E(sum from i=1 to n (Xi-X_bar)^2. Is there any other method ? please explain how the method work instead of just solving and list out

step by step and follow the comments.

Math   Statistics-And-Probability   
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