【单选题】【消耗次数：1】
假设计划任务数是五年计划中规定最后一年应达到的水平，计算计划完成程度相对指标可采用（ ）
①
累计法
②
水平法
③
简单平均法
④
加权平均法
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【多选题】
下列表述中，可以用加权算术平均法计算的平均数的有（）
①
已知各组计划完成百分数和各组计划产值，求平均计划完成百分数
②
已知各组计划完成百分数和各组实际产值，求平均计划完成百分数
③
已知公司下属各企业劳动生产率和企业产值，求平均劳动生产率
④
已知商场各商品个体销售量指数和各商品基期销售额，求该商场的销售量指数
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