100 Students have 60 marks average in maths and 50 students have
average marks 90 in economics. Then the average of 150 students
taken together is
(a) 30
(b) 50
(c) 70
(d) 90
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Answer:
C. average average marks equal to n 1 X 1 + and 2 x 2 bar upon and one plus and two equal to
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