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9设随机变量X和Y相互独立．X～N(μ 1 ， )，Y～N(μ 2 ， )，X 1 ，X 2 ，…，X 16 是X的一个样本，Y 1 ，Y 2 ，…，Y 10 是Y的一个样本，测得数据 (1)分别求μ 1 ，μ 2 ，的矩估计值； (2)分别求 ， 的极大似然估计值；
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举一反三
【简答题】停车需求预测分为 、宏观预测两类。
【简答题】根据下列材料请回答 62～66 题： 第 62 题 The underlined word in the second paragraph means _________.
【单选题】根据以下材料，回答下列各题： Questions 62 to 66 are based on the following passage.??????? Researchers in the field of psychology have found that one of the best ways to make an important decision, such as choosing...
A.
listing the consequences of each solution
B.
calculating a numerical summary of each solution
C.
writing down all possible solutions
D.
deciding which consequences are most important
【简答题】停车需求预测分为 、 预测两类。
【单选题】Questions 62～66 are based on the following passage. I don’t ever want to talk about being a woman scientist again. There was a time in my life when people asked constantly for stories about what it’s ...
A.
She feels unhappy working in male-dominated fields.
B.
She is fed up with the issue of gender discrimination.
C.
She is not good at telling stories of the kind.
D.
She finds space research more important
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