Let the p,m f. of r.v X be d `p(x)+((4) ,(x))(5/9)^x(4/9)^(4-x)` , x= 0,1,2,3,4. . Find E(X) and Var(X)

Let the p.m.f or r.v.x be P(X)=(4/x)(5/x)^x(4/9)^(4-x) ,x=0,1,2,3,4.Find E(X) and V(x).

If p.m.f of a r.v.X is P(X)=P(A)=(4/x)(5/9)^x.(4/9)^(4-x) ,x=0,1,2,3,4 then E(X)=………….

Let the p.m.f. ( probability mass function ) of random variable x be P(x) = (4/x)(5/9)^(x)(4/x)^(4-x), x = 0, 1, 2, 3, 4 = 0 , otherwise Find E(x) and Var.(x)