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In a class there are 35 boys and 46 girls. The mean marks of boys are 50. The mean mark of class is 40. Find the mean marks of girls.

 
Guest Sep 17, 2017
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Total marks of boys = 35*50 → 1750

Total marks of girls = 46*gave

Total marks of class = (35 + 46)*40 → 81*40 → 3240

 

So we must have:  1750 + 46*gave = 3240

 

 46*gave = 3240 - 1750 

 

gave = (3240 - 1750)/46 ≈ 32.4

.

 
Alan  Sep 17, 2017

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