【单选题】【消耗次数：1】
调查2018级统计系62名同学学习成绩，获得部分信息，其中属于总体单位总量指标的是?
①
班级学生人数62人
②
全班“回归分析”平均成绩为75.6分
③
全班“高等数学”成绩总和为4340分
④
全班同学的学习成绩
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