【单选题】【消耗次数：1】
乙两班学生统计学考试成绩：甲班平均分为70分，标准差为7.5分；乙班平均分为75分，标准差为7.5分。由此可知两个班考试成绩的离散程度（）
①
甲班较大
②
乙班较大
③
两班相同
④
无法做比较
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