【判断题】【消耗次数：1】
在特定条件下，加权算术平均数等于简单算术平均数。
①
正确
②
错误
参考答案：
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在什么条件下，加权算术平均数等于简单算术平均数( )。
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各组变量值不等
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变量数列为组距数列
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各组次数都为1
⑤
各组次数占总次数的比重相等
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