Which of the following is true for XXX being a non-negative random variable?
E[X]=∫0∞P(X>x)dxE[X] = \int_{0}^{\infty} P(X > x) dxE[X]=∫0∞P(X>x)dx
E[X]=∫0∞xf(x)dxE[X] = \int_{0}^{\infty} x f(x) dxE[X]=∫0∞xf(x)dx
E[X]=∫0∞(1−F(x))dxE[X] = \int_{0}^{\infty} (1 - F(x)) dxE[X]=∫0∞(1−F(x))dx
All of the above