76 is the average of 75 and 77.
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308 / 4 = 77
75-85 As in 75, 76, 77 etc To answer this type of question you think of it as an average, and work backwards
7/75 x 100% = 9.33 % you may use the online calculator linked below
(81 + 77 + 83 + 75 + X) divided by 5 = 80 average 316 + X = 400 X = 84
102.67%