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W be the mean weight and m and be n be boys and girls .
Wboys= sum of weights / m
Wgirls = sum of weights /n
sum of weights of boys = Wb * m =70 m
sum of weights of girls = Wg *n = 55 n
Mean Weight (W)
= (sum of boys + sum of girls) / 150
60*150 = 70m + 55n
also m + n = 150
solve both equations to get m and n.
9000 = 70(150-n) +55n = -15n +150*70
15n = 1500
n =100
m = 50
Wboys= sum of weights / m
Wgirls = sum of weights /n
sum of weights of boys = Wb * m =70 m
sum of weights of girls = Wg *n = 55 n
Mean Weight (W)
= (sum of boys + sum of girls) / 150
60*150 = 70m + 55n
also m + n = 150
solve both equations to get m and n.
9000 = 70(150-n) +55n = -15n +150*70
15n = 1500
n =100
m = 50
mallelavenkaiah:
nicr sir
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