In a class of 50 students, the average marks of 20 girls is 38 and the average marks of 30 boys is 33.Find the average marks of all the student of a class .
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Boys total marks=33×30=990
Girls -----------------=20×38=760
total marks 50 stdt =1750
average of all stdt= 1750/50=35
Girls -----------------=20×38=760
total marks 50 stdt =1750
average of all stdt= 1750/50=35
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