Solving for Population of Two Levels in a Two Level System: Stat Mech HW Help

[babbagee]

Homework Statement

Consider a two level system where the ground state is doubly degenerate and the exited state of energy E is four fold degenerate. Write down the partition function and mathematical expressions for the populations of the two levels.

Homework Equations

z=e^-E/kt
n_i = N(e^-E/kt)/z
n_i = NP_i
where N is total number of molecules, P is probability, E is energy, k is boltzman constant

The Attempt at a Solution

Ok I don't really need any form of solution for this question I just needed clarification. It is asking me for the expresssions for the population of the two levels. I am getting counfused about if it is asking me for the number of molecules in each level or is it asking for the probability.

Thanks in advance

 

[christianjb]

write the answer in terms of n_i/N=Pi, the probability or the fraction of molecules.