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考试的历史平均分为 mu = 3,5 ,标准差 sigma = 1,5 。对于 n = 36 的班级,班级平均分小于3.2的概率是多少?
考试的历史平均分为 mu = 3,5 ,标准差 sigma = 1,5 。对于 n = 36 的班级,班级平均分小于3.2的概率是多少?
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