Let XXX have MGF MX(t)=(0.3+0.7et)20M_X(t) = (0.3 + 0.7e^t)^{20}MX(t)=(0.3+0.7et)20. What are the mean and variance?
E[X]=14,Var(X)=4.2E[X] = 14, Var(X) = 4.2E[X]=14,Var(X)=4.2
E[X]=14,Var(X)=8.4E[X] = 14, Var(X) = 8.4E[X]=14,Var(X)=8.4
E[X]=6,Var(X)=4.2E[X] = 6, Var(X) = 4.2E[X]=6,Var(X)=4.2
E[X]=20,Var(X)=14E[X] = 20, Var(X) = 14E[X]=20,Var(X)=14