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82.1.2的80%? 83.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 84.3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 85.A数列有5个数,w,x,y,z,t, 问下面哪个数列的sd和A 相同? |w|,|x|,|y|,|z|,|t| 1/w,1/x,1/y,1/z,1/t 7w,7x,7y,7z,7t,7t w^2,x^2,y^2,x^2,t^2 w-7,x-7,y-7,z-7,t-7 我不知道选什么 86.a jogger\\\\\\s speed is 10 kelometer per hour, walker 6k/hour, 有个water foundation , if the jogger pass the water foundation after passing the walker, howmany minitutes does the jogger pass the water foundation before the walker. 87. 有两个人存了相同的一笔钱到银行,A是按照每月x% 复利记息,B是按照每年y%复利记息,问,一年后,若两人获得相同的利息, 两人存的钱是 x=7 88.Buy with the wholesale price, and sell as 10% discount as the list price, a 20% profit on the wholesale price, what is the list price.. Answer : 120 89.The range of 1/2 + 1/2^2+ 1/2^3+.+1/2^10 A: 01/2 B: 2/3---1 C cannot remember , I forget the formual for this | 
