Please reason step by step, and put your final answer within \boxed{}.
Kamal obtained 76 out of 120 in English, 60 out of 110 in Mathematics, 82 out of 100 in Physics, 67 out of 90 in Chemistry, 85 out of 100 in Biology, and 78 out of 95 in History. What are his average marks, considering the different total marks for each subject?
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