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Nov 4, 2017 at 15:20 comment added Cliff AB Very nice! When I went back and tried to differentiate the CDF, I looked at the sum of $n$ choose $j$'s and got very scared (after realizing my mistake about there being $k$ or more $X_i...$)!
Nov 3, 2017 at 19:52 history answered whuber CC BY-SA 3.0