Probablity-Gravner-58

Question

Let $X$ be a random variable with $P(X=1) =0.2,P(X=2)=0.3$, and $P(X=3)=0.5$. What is the expected value of $X$?

Answer 1

E(X)= 0.2*1+0.3*2+0.5*3

E(X)-0.2 + 0.6 +1.5=2.3

Expected value of X is 2.3