Three random variables X, Y, and Z have the equal variance of σ 2 = 2. X is independent of both Y and Z, and that Y and Z are correlated with a correlation coefficient of 0.8. What is the covariance between X and K given that K=Y+Z?
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- 公共卫生执业医师
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1.Three random variables X, Y, and Z have the equal variance of σ 2 = 2.
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2.设y z/x=x y/z=x z/y=k,求k?
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3.y=Z - π 2 kπ＜x≤kπ，k∈
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4.设 |x z|＜|y|(x,y,z∈R)，则A、|x|＞|z|-|y|B、|x|＞|y|-|z|C、|x|＜|z|-|y|D、|x|＜|y|-|z|
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5.设w、x、y、z、k均为int型变量，则执行下面语句后的k值是（ ）。w=1;x=2;y=3;z=4;k=(w
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6.【单选题】设x=2,y=3,z=4,k=5，则表达式“x
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7.设 |x z|＜|y|(x,y,z∈R)，则 A.|x|＞|z|-|y| B.|x|＞|y|-|z| C.|x|＜|z|-|y| D.|x|＜|y|-|z|
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8.已知x，y，z∈R，且x y z=1，xR，且x y z=1，x 2 y 2 z 2 = ，证明：x，y，z∈[0， ]．
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9.在A ． y ＞ x ， y ＞ z B ． x ＞ y ＞ z C ． y ＜x， y ＜ z D ． x ＜ y ＜ z
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10.The correlation coefficient between two variables X and Y is 0.4.
