There are 60 students in a class of which 40 boys and rest girls. the average weight of class is 45kg and average weight of girls is 40 kg. it was observed that weights of two boys were taken wrong as 42 and 50 kg while the corrected weights are 46 and 40 kg. find the corrected mean of the class.
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Given, avg weight of 60 students = 45 Kg
Sum total of weights = 45*60 = 2700 Kg
No: of boys = 40...No: of girls = 20
Avg wt of girls = 40 Kg
Sum total of girls weight = 20*40 = 800 Kg
So, sum total of boys weight = 2700-800 = 1900 Kg
Now,the weight of 2 boys were wrongly entered as 42,50
The correct weights = 46,40
Hence, corrected sum total of boys weight = 1900 - 42 - 50 + 46 + 40 = 1894
Total weight of whole class = 1894+800 = 2694
Hence corrected average = 2694/60 = 44.9 Kg
Hope it helps.
Sum total of weights = 45*60 = 2700 Kg
No: of boys = 40...No: of girls = 20
Avg wt of girls = 40 Kg
Sum total of girls weight = 20*40 = 800 Kg
So, sum total of boys weight = 2700-800 = 1900 Kg
Now,the weight of 2 boys were wrongly entered as 42,50
The correct weights = 46,40
Hence, corrected sum total of boys weight = 1900 - 42 - 50 + 46 + 40 = 1894
Total weight of whole class = 1894+800 = 2694
Hence corrected average = 2694/60 = 44.9 Kg
Hope it helps.
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