已知(X,Y)的分布律为
X\Y123
00.10.20.3
10.01500.25
则P{X<1}=_____,P{X<2}=_____,P{Y≤2}=____,P{X≤1,Y<2}=_____.
P{X<1}=P{X=0}=0.1+0.2+0.3=0.6 P{X<2}=P{X=1}=0.1+0.15=0.25 P{Y≤2}=P{Y=1}+P{Y=2}=0.1+0.15+0.2+0=0.45 P{X≤1,Y<2}=P{X=1,Y=1}+P{X=0,Y=1}=0.25
已知(X,Y)的分布律为
X\Y123
00.10.20.3
10.01500.25
则P{X<1}=_____,P{X<2}=_____,P{Y≤2}=____,P{X≤1,Y<2}=_____.
P{X<1}=P{X=0}=0.1+0.2+0.3=0.6 P{X<2}=P{X=1}=0.1+0.15=0.25 P{Y≤2}=P{Y=1}+P{Y=2}=0.1+0.15+0.2+0=0.45 P{X≤1,Y<2}=P{X=1,Y=1}+P{X=0,Y=1}=0.25