【判断题】【消耗次数：1】
未知计算平均数的基本公式中的分子资料时，应采用加权算术平均数方法计算。
①
正确
②
错误
参考答案：
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相关题目
【多选题】
在什么条件下，加权算术平均数等于简单算术平均数( )。
①
各组次数相等
②
各组变量值不等
③
变量数列为组距数列
④
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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is playing
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plays
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was playing
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played
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how;which
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how;that
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businesses employed
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businesses had employed?
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having lost
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to be lost
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dares catches
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