Let XXX have PDF f(x)=12sin(x)f(x) = \frac{1}{2} \sin(x)f(x)=21sin(x) for x∈[0,π]x \in [0, \pi]x∈[0,π]. What is E[X]E[X]E[X]?
π/2\pi/2π/2
π/4\pi/4π/4
111
222