A continuous random variable XXX has the PDF f(x)=364x2f(x) = \frac{3}{64}x^2f(x)=643x2 for 0≤x≤40 \leq x \leq 40≤x≤4. What is P(X≤2)P(X \leq 2)P(X≤2)?
18\frac{1}{8}81
14\frac{1}{4}41
12\frac{1}{2}21
38\frac{3}{8}83