A continuous random variable XXX has PDF f(x)=2(1−x)f(x) = 2(1-x)f(x)=2(1−x) for 0≤x≤10 \leq x \leq 10≤x≤1. What is the mean E[X]E[X]E[X]?
1/2
1/3
1/4
2/3