If the moment generating function of XXX is MX(t)=(0.3+0.7et)5M_X(t) = (0.3 + 0.7 e^t)^5MX(t)=(0.3+0.7et)5, what is E[X]E[X]E[X]?
1.51.51.5
3.53.53.5
0.70.70.7
5.05.05.0