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Jul 15, 2016 at 11:28 vote accept math110
Jul 15, 2016 at 11:28
Jul 15, 2016 at 4:54 comment added Sergei @T.Amdeberhan - you are right with $\sqrt{\frac{5n}{3}}$, I mean arithmetic mean by mistake, thank you.
Jul 14, 2016 at 6:23 history answered Sergei CC BY-SA 3.0