A random variable XXX has the MGF MX(t)=(0.2+0.8et)nM_X(t) = (0.2 + 0.8e^t)^nMX(t)=(0.2+0.8et)n. What is the mean E[X]E[X]E[X]?
0.2n0.2n0.2n
0.8n0.8n0.8n
nnn
0.80.80.8