Let XXX have CDF F(x)=x327F(x) = \frac{x^3}{27}F(x)=27x3 for 0≤x≤30 \le x \le 30≤x≤3. What is E[X]E[X]E[X]?
94\frac{9}{4}49
222
32\frac{3}{2}23
125\frac{12}{5}512