Let XXX have MGF MX(t)=(0.3+0.7et)4M_X(t) = (0.3 + 0.7e^t)^4MX(t)=(0.3+0.7et)4. What is the mean E[X]E[X]E[X]?
1.21.21.2
2.82.82.8
2.12.12.1
0.70.70.7