the mean weight of 60 students of a class is 40kg. the mean weight of boys is 50kg while that of the girls is 30kg.find the numbers of boys and girls in the class. fast plz..................!!!!!
Answers
Answered by
0
i thin its ans is
80 boys
50 girls
80 boys
50 girls
Answered by
2
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
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
Similar questions