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Quant版 - 一道比较有意思的题 -- old question revisit
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c**********e
发帖数: 2007
1
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)
Original source without discussion:
http://www.mitbbs.com/article_t/Quant/15402574.html
p*****k
发帖数: 318
2
a corollary of one-sided Chebyshev inequality.
details can be found here:
http://en.wikipedia.org/wiki/Chebyshev%27s_inequality
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