A discrete random variable XXX has P(X=1)=0.3P(X=1)=0.3P(X=1)=0.3, P(X=2)=0.5P(X=2)=0.5P(X=2)=0.5, P(X=3)=0.2P(X=3)=0.2P(X=3)=0.2. Find E[X]E[X]E[X].
1.91.91.9
2.02.02.0
1.81.81.8
2.12.12.1