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标题: 补充JJ [打印本页]

作者: xingzhihua    时间: 2003-12-10 01:06     标题: 补充JJ

1,1.2的80%?
2,Give the English definition of standard deviation, 2 or 3 lines, there are 4 numbers,  9, 8, 7, 4, ask the standard deviation of these 4 numbers。ANS:根号下14
3,3个不同的旗子排列视为一个信号,有四面不同的旗子,可排成几个信号?ANS:24




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