Given XXX has PDF f(x)=2xf(x) = 2xf(x)=2x for x∈[0,1]x \in [0, 1]x∈[0,1], what is the coefficient of variation CV=σ/μCV = \sigma/\muCV=σ/μ?
2/3\sqrt{2}/32/3
2/4\sqrt{2}/42/4
1/2
3/2\sqrt{3}/23/2