physical chemistry PLEASE HELP!!!

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given E, = l^2 h^2 / 2 m r^2 calculate energies for an electron localised to a circle of radius 2 x 10^-9 m for l = 0,1,2, draw pictures of three levels and calculate the relative populations of these levels at 300K

i did the first bit but came out with, 0, 6.0249 x 10-6 J mol-1 and 2.4099 x 10-5 J mol-1 are these right and how do i work out the second part and what kind of picture?? Confused

appreciate the help btw i used m = 9.109 x 10^-31 kg for the mass of an electron

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