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chopinor (lonelycat) 于 (Tue Jan 16 17:58:27 2007) 提到:
严格来说不算brainteaser,不过有点probability基本的知识就可以解
任给n个数,证明平均值和中位数的差小于等于标准差
或者给一个随机变量X, 证明
(med(X)-mean(X))^2 <= var(X)
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pseudo (small man) 于 (Tue Jan 16 19:24:17 2007) 提到:
a very classical question. one-side chebychev.
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chopinor (lonelycat) 于 (Tue Jan 16 19:36:23 2007) 提到:
actually, there is a more interesting proof t |
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