Ch2-19 P(X≥2)=1-P(X<2) =1-P(X=0)-P(X=1) =1-0.84=0.16 或 P(X≥2)=1-PX<2) =1-[P(Xs2)-P(X=2) =1-F(2-0 0.16 此式应理解为极限mF(x) x→>2Ch2-19 1 0.84 0.16 1 ( 0) ( 1) ( 2) 1 ( 2) = − = = − = − =  = −  P X P X P X P X   0.16 1 (2 0) 1 ( 2) ( 2) ( 2) 1 ( 2) = = − − = −  − =  = −  F P X P X P X P X 或 此式应理解为极限 lim ( ) 2 F x x→ −