Let XXX be a continuous random variable with PDF f(x)=13f(x) = \frac{1}{3}f(x)=31 for x∈[0,3]x \in [0, 3]x∈[0,3]. What is E[X]E[X]E[X]?
1.01.01.0
1.51.51.5
2.02.02.0
3.03.03.0