A discrete random variable has P(X=1)=0.5P(X=1)=0.5P(X=1)=0.5, P(X=2)=0.3P(X=2)=0.3P(X=2)=0.3, P(X=3)=0.2P(X=3)=0.2P(X=3)=0.2. What is E[X]E[X]E[X]?
1.5
1.7
2
2.3