【单选题】【消耗次数：1】
某连续变量，其末组为开口组，下限为500，又知其邻组的组中值为480，则其末组的组中值为?
①
490
②
500
③
510
④
520
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相关题目
【多选题】
在组距数列中,组中值
①
上限和下限之间的中点数值
②
用来代表各组标志值的平均水平
③
在开放式分组中无法确定
④
就是组平均数
⑤
在开放式分组中，可以参照相邻组的组距来确定
【多选题】
在组距数列中,组中值
①
上限和下限之间的中点数值
②
用来代表各组标志值的平均水平
③
在开放式分组中无法确定
④
就是组平均数
⑤
在开放式分组中,可以参照相邻组的组距来确定
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在组距数列中,组中值说法不对的是( )。
①
上限和下限之间的中点数值
②
用来代表各组标志值的平均水平
③
在开放式分组中无法确定
④
在开放式分组中,可以参照相邻组的组距来确定
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