我
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若随机变量X的分布为
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设随机变量X的分布函数为
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设随机变量X的概率密度为
- A.－3
- B.－1
- C.－1/2
- D.1
- A.N(0，2)
- B.x<sup>2</sup>(2)
- C.t(2)
- D.F(1，1)
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- A.6
- B.3
- C.1
- D.<img src="//img1.yqda.net/question-name/e3/ad5d6567411924cd59e2aac2b0c440.jpg" height="24" width="12" />
- A.D(X＋C)＝D(X)＋C
- B.D(X－C)＝D(X)－C
- C.D(CX)＝CD(X)
- D.D(CX＋1)＝C<sup>2</sup>D(X)
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- A.<img src="//img1.yqda.net/question-name/09/42301f18dd850cea5d3208e6d2bc2c.jpg" alt="" />
- B.<img src="//img1.yqda.net/question-name/b7/61a5d048cbc35aa01039cd3f420f14.jpg" alt="" />
- C.<img src="//img1.yqda.net/question-name/cf/9740bf44a7ab8abf03e8fed3bdd032.jpg" alt="" />
- D.<img src="//img1.yqda.net/question-name/52/bf6a8daa65d57793b2d980b45a499d.jpg" alt="" />
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- A.a为置信水平
- B.1－a为置信水平
- C.n为样本容量
- D.<img src="//img1.yqda.net/question-name/5c/03f3d7426d04aabcd7d92c1bb8e039.jpg" alt="" />
- A.D(X)＋D(Y)
- B.D(X)－D(Y)
- C.D(X)＋D(Y)－2Cov(X，Y)
- D.D(X)－D(Y)＋2Cov(X，Y)
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- A.xk非负
- B.xk为整数
- C.O≤Pk≤2
- D.Pk≥2
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- A.<img src="//img1.yqda.net/question-name/ba/6d8b9b8a123d21f9a504ff229ed889.jpg" alt="" />
- B.<img src="//img1.yqda.net/question-name/b4/c735c536a3f1daa9ff3f92d3e265bc.jpg" alt="" />
- C.<img src="//img1.yqda.net/question-name/55/ca2172b9002517b57f28a69d201a8d.jpg" alt="" />
- D.<img src="//img1.yqda.net/question-name/52/8db597aa228be3137561626d6056b3.jpg" alt="" />
- A.E(X)＝0．5，D(X)＝0．25
- B.E(X)＝2，D(X)＝2
- C.E(X)＝0．5，D(X)＝0．5
- D.E(X)＝2，D(X)＝4
