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第五章 随机变量的数字特征

第五章 随机变量的数字特征. 5.1. 填空题. 解答. 返回. 5.2. 设 X 服从 B (3,0.4), 求 X , X 2 与 X ( X - 2) 的数学期望及 X 的方差. 解答. 5.3 已知 EX =3, DX =5, 求 E ( X +2) 2. 解答. 5.4 已知随机变量 X 与 Y 相互独立 , 且 DX =8, DY =4, 求 D (2 X - Y ). 解答. 返回. 5.5. 设 X 与 Y 均服从正态分布 N (1,2) 且 X 与 Y 相互独立 , 求 D ( XY ). 解答.

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第五章 随机变量的数字特征

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  1. 第五章 随机变量的数字特征

  2. 5.1 填空题 解答 返回

  3. 5.2 设X服从B(3,0.4), 求X, X2与X(X-2)的数学期望及X的方差. 解答 5.3已知EX=3, DX=5, 求E(X+2)2. 解答 5.4已知随机变量X与Y相互独立, 且DX=8, DY=4, 求D(2X-Y). 解答 返回

  4. 5.5 设X与Y均服从正态分布N(1,2)且X与Y相互独立, 求D(XY). 解答 5.6设二维随机变量(X,Y)的分布密度为 求X的数学期望. 解答 返回

  5. 5.7 设X,Y相互独立, 分布密度分别为 求E(XY) . 解答 5.8设X是具有数学期望和方差的连续型随机变量, C是常数, 证明: E(CX)=CEX, D(CX)=C2DX 解答 返回

  6. 5.9 解答 返回

  7. 5.10 解答 解答 返回

  8. 5.12 解答 解答 返回

  9. 5.14 解答 解答 返回

  10. 5.16 解答 解答 返回

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