Let XXX have PDF f(x)=3x2f(x) = 3x^2f(x)=3x2 for x∈[0,1]x \in [0, 1]x∈[0,1]. What is E[X]E[X]E[X]?
0.600.600.60
0.650.650.65
0.700.700.70
0.750.750.75