The statistical distributions of toner adhesive force F_a and detach field E_d, arising from distributions in toner radius r and charge density q are examined mathematically. The widening of F_a distribution and the narrowing of E_d distribution, compared to r and/or q distributions, have been predicted. Since E_d is a quantity more relevant than F_a in electrophotography, this finding suggests that the effects of toner size and/or charge dispersions on toner adhesion in electrophotography may be weaker than generally expected.