Given P(X =2, Y= 10) =0.3, P(X=6, Y=2.5) =0.4, and P(X =10,Y=0)=0.3, then Cov(XY) is:()A. -12.0.B. 24
解方程. 0.3x+13=254x-6×9=987x+3x+26=743.8x-x=0.56.[64%]
解方程.0.3x+13=254x-6×9=987x+3x+26=743.8x-x=0.56.
求不等式0.3x+0.40.3[64%]
求不等式0.3x+0.40.3-0.1x-0.20.2>x-16的正整数解.
由0.3x[64%]
由0.3x-16y=2,写出用x表示y的代数式.
将方程0.7+0.3x[64%]
将方程0.7+0.3x-0.20.2=1.5-5x0.5变形正确的是( )A.7+3x-22=15-50x5B.0.7+3x-22=15-5x5C.0.7+3x-22=15-50x5D.0.7+1.5x-1=3-x
若随机变量X-U(0.3)则P{-1(X<2}=[64%]
若随机变量X-U(0.3)则P{-1(X<2}=
Given P(X=2) =0.3, P(X=3) =0.4, P(X=4) =0.[64%]
Given P(X=2) =0.3, P(X=3) =0.4, P(X=4) =0.3. What is the variance of X()A.0.3.B.0.6.C. 3.0.
设X是随机变量.已知P(X≤1)=0.3,P(X≥2)=0.4,则P(1<X<2)等于( ).[64%]
设X是随机变量.已知P(X≤1)=0.3,P(X≥2)=0.4,则P(1<X<2)等于( ).A.0.2
B.0.3
C.0.4
D.0.7
线性方程y=2.1+0.3x其斜率为[64%]
线性方程y=2.1+0.3x其斜率为A、0.3B、0.7C、2.1D、6.3E、2.4
设随机变量X服从二点分布,如果P{X=1}=0.3,则P{X=0}的概率为()。[64%]
A.0.2B.0.3C.0.8D.0.7