统计学试题答案五种新型车的最高时速为100、125、115、175、120.则标准差为( )A、28.4165 B、807.5 C、25.4165 D、6468个变量值,其对6的离差分别为-3、-2、0、0、4、3、4、2,可知( )A、这8个数中有

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