Average marks of 3 classes a,b,and c are 30,50,and 70. If avg marks of class a and b are 45 and class band c are 65 then what is the average of a,band c put it all together
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The average marks of 70, 50 and 30 students respectively is 50, 55 and 45 marks. Therefore the total marks of 70, 50 and 30 students will be 70×50,50×55 and 30×45 respectively. So the average marks of all the 150 students is
=(70+50+30)(3500+2750+1350)
=1507,600
=50.67
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