word choice - "an average of" vs "on average"


I am trying to write a job application with a sentence about my averaged evaluation. But, I don't know which expression is correct or more appropriate in the formal letter.


1) The overall performance evaluation is an average of 5 out of 6 since the fall 2011.


2) The overall performance evaluation is a 5 out of 6 on average since the fall 2011.


Thank you so much for your help in advance.




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