A continuous random variable XXX has PDF f(x)=kx3f(x) = k x^3f(x)=kx3 for 0≤x≤10 \leq x \leq 10≤x≤1. Find the value of E[X2]E[X^2]E[X2].
0.50.50.5
0.60.60.6
0.750.750.75
0.80.80.8