it means out of 30 only 4 are successful example 30 people appy for jobs only 4 of those people get a job
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The mean is the average = (6+9+101+4)/4 = 30
30+35+39+36=140 mean= 140/4 therefore mean=35
If you mean 3/4 of 40 then it is 30
It is: 30+35+27+40 = 132 and 132/4 = 33 which is the mean average
It is: 10+25+30+35 = 100 and 100/4 = 25 which is the average mean value