补充JJ
onion 2003-12-11 21:17:33
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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