【单选题】【消耗次数：1】
均数与标准差计算的数值( )
①
均数可以是负数，标准差不可以
②
均数不可以是负数，标准差可以
③
两者都可以是负数
④
两者都不可以是负数
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相关题目
【单选题】
均数和标准差的关系是:（）。
①
均数愈大,S愈小
②
均数愈大,S愈大
③
S愈大,均数对各变量值的代表性愈好
④
S愈小,均数对各变量值的代表性愈好
⑤
S愈小,均数与总体均数的距离愈大
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