Let XXX be continuous with PDF f(x)=4x3f(x) = 4x^3f(x)=4x3 for 0≤x≤10 \leq x \leq 10≤x≤1. What is P(X≥0.5)P(X \geq 0.5)P(X≥0.5)?
116\frac{1}{16}161
14\frac{1}{4}41
1516\frac{15}{16}1615
12\frac{1}{2}21