77.5 is the average.
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The idea is to add the five numbers, then divide the result by 5 (in this case, you divide by 5, because there are 5 numbers).
The mean average is (92 + 78 + 108) ÷ 3 = 922/3 The median average of {92, 78, 108} is the middle number of {78, 92, 108}, ie 92. There is no mode average as each number appears once.
The average is (28+92)/2 = 120/2 = 60
102.2727273 is the mean.
The average is 86.