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【多选题】
某批产品共计有4000件,为了了解这批产品的质量,从中随机抽取200件进行质量检验,发现其中有30件不合格。根据抽样结果进行推断,下列说法正确的有A.
样本合格率的抽样分布服从正态分布
B.
总体合格率是一个估计量
C.
样本合格率是一个统计量
D.
n =200
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A.
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