The idea is first apply the inequality x1^2 + x2^2 + ... + xn^2 >= (X1+x2+...+xn)^2/n, then use the trick for Prob 8 again.
The idea is first apply the inequality x1^2 + x2^2 + ... + xn^2 >= (X1+x2+...+xn)^2/n, then use the trick for Prob 8 again.
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