A random variable XXX has PDF f(x)=2xf(x) = 2xf(x)=2x for 0≤x≤10 \le x \le 10≤x≤1. What is the variance Var(X)Var(X)Var(X)?
1/181/181/18
1/61/61/6
1/31/31/3
1/21/21/2