mean和standard deviation的关系是什么来着...

mean和standard deviation的关系是什么来着... standard deviation;root-mean-square deviation是什么意思 用计算器算平均数和标准差,+15谁知道怎么用计算器算平均数(mean)和标准差(standard deviation),一小时内回答+15 standard deviation同mean deviation有什么不同?两者其实是什么东西?“同”字换成“和”字(打错了) 3%的冲压被拒绝.如果有1个产品,测试400次,求 概率分布 的 平均数(mean) 和 标准偏差(standard deviation). standard standard standard criteria和standard的区别? 什么是mean error和mean squared error? mean和meaning for a certain exam,a score of 58 was 2 standard deviations below the mean and a score of 98 was 3 standard deviations above the mean .what was the mean score for the exam for a certain exam,a score of 58 was 2 standard deviations below the mean and a score of 98 was 3 standard deviations above the mean .what was the mean score for the exam standard room 和twin room的差别 VOA的special 和standard的区别 standard和criteria,criterion有什么差别 standards和standard有什么不同? No station ID和Res:standard是什么意思?