in a class of 100 students the mean mark obtained is 30 and in another class of 50 student the mean mark obtained is 60.find the mean mark obtained by the student of two class taken together
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100 srudent still in the classs
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total marks obtained by students of first class = 100×30 =3,000.
total marks obtained by students of another class = 50×60 =3,000.
total marks obtained by students of both classes =3,000 + 3,000 =6,000.
total number of students = 100+50 =150.
mean mark = 6000/150 =40.
total marks obtained by students of another class = 50×60 =3,000.
total marks obtained by students of both classes =3,000 + 3,000 =6,000.
total number of students = 100+50 =150.
mean mark = 6000/150 =40.
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