Example
nMajor             (freq) (proportion)               %   
nPsychology               27             27/124=.2178               21.78%          
nChemistry                 54              54/124=.4355            43.55%
nBiology                     43             43/124=.3468            34.68%
n                        n = 124                         1.0001                  100.01%