Let XXX be a continuous random variable with PDF f(x)=4x(1−x)f(x) = 4x(1-x)f(x)=4x(1−x) for 0≤x≤10 \le x \le 10≤x≤1. What is E[X]E[X]E[X]?
0.25
0.4
0.5
0.6