Maxwell-Boltzmann distribution

(4pi((0.028)/(2pi(1.38*10^-23)(20)))^(3/2))*(202^2*e^((-0.028*202^2)/(2pi(1.38*10^-23)(20)))) - (4pi((0.028)/(2pi(1.38*10^-23)(20)))^(3/2))*(200^2*e^((-0.028*200^2)/(2pi(1.38*10^-23)(20))))