Let XXX have PDF f(x)=c(3−x)f(x) = c(3-x)f(x)=c(3−x) for 0≤x≤30 \le x \le 30≤x≤3. Find the variance of XXX.
34\frac{3}{4}43
32\frac{3}{2}23
94\frac{9}{4}49
920\frac{9}{20}209