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从均值为100、标准差为10的总体中,抽出一个的简单随机样本,样本均值的数学期望和方差分别为( )

单选题
2021-07-17 23:57
A、100和2
B、100和0.2
C、10和1.4
D、10和2
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正确答案
A

试题解析

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