30 + 40 + 10 + 40 = 120
120/4 = 30
Average = 30
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30
40 - 30 = 10 if question is percent then 40 = 100% 4 = 10% 12 = 30% 40 - 12 = 28
50 + 40 + 40 + 40 + 30 + 30 + 20 + 10 = 260
30 + 40 = 7070/2 = 35
It is: 30+35+27+40 = 132 and 132/4 = 33 which is the mean average