Question

let B(e) denote the ball or radius (e) centered at the (x0,y0,z0) and let B'(e) denote the volume of the ball show that:
lim (as e approaches 0) of [1/B'(e)][\[\int\limits_{}^{}\int\limits_{}^{}\int\limits_{}^{}\] B(e) f(x,y,z) dV= f(x0,y0,z0)