Consider the boltzmann-gibbs principle, also known as the fundamental principle or postulate of statistical mechanics.
a) state that principle for a system that is classically described.
b) state that principle for a system that is quantumly described.
in both cases, be careful to mention the system conditions in which the principle is considered valid

As seen in a us weather map, the h (or high) and l (or low) symbols indicate regions where surface air pressures are high or low, respectively, compared to surrounding areas. an h is plotted where the air pressure is highest and an l is plotted where the air pressure is lowest. proceeding outward and away from the center of a high pressure system, the air pressure "