Answers

2016-02-29T21:22:20+05:30
I thin its ans is
80 boys
50 girls
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2016-02-29T21:27:09+05:30
Let take boy = x
girl = y
sigma Xi1 = (50)x
sigma Xi2 = (30)y
mean of 60 students =
(50x +30y)/X+Y
then you will get your answer as given ahead
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