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I googled and wikipedia, so if anyone has the same question, here is the answer
my Comlex step 3 score = 428, mean = 500, SD = 120
428 - 500 / 120 = -0.6 (my z score)
http://www.acposb.on.ca/conversion.htm
based on above table, I score in 27.4 percentile
But if I look at my 2 dgit score 79, Mean 80, SD 4
79 - 80 / 4 = -0.25
Based on this Im in the 40th %
my Comlex step 3 score = 428, mean = 500, SD = 120
428 - 500 / 120 = -0.6 (my z score)
http://www.acposb.on.ca/conversion.htm
based on above table, I score in 27.4 percentile
But if I look at my 2 dgit score 79, Mean 80, SD 4
79 - 80 / 4 = -0.25
Based on this Im in the 40th %