We consider the positivity of the sum ∑ n i=1 ρi (ξi) , where is a convex function of higher order, as well as analogous results involving the integral ∫ b 0 a 0 ρ(ξ) (g(ξ))dξ. We use a representation of the function via the Fink identity and the Green function that leads us to identities from which we obtain conditions for positivity of the above-mentioned sum and integral. We also obtain bounds for the integral remainders which occur in these identities, as well as corresponding mean value results.