If XXX is a discrete random variable with P(X=1)=0.5P(X=1) = 0.5P(X=1)=0.5 and P(X=−1)=0.5P(X=-1) = 0.5P(X=−1)=0.5, what is E[X]E[X]E[X]?
-1
0
0.5
1