The mean weight of 60 students in a class is 40 kg. The mean weight of boys is 50 kg while that of girls is 30 kg. Find the number of boys and girls in the class.
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no of observations =60
total weight of all 60 students=60*40=2400
let no of boys be x and no of girls be y
total weight of boys =mean *number: 50*x
total weight of girls =mean *number.: 30 *y
therefore
(50x+30y) /60=40........(1..)
x+y=60...... (2.)
solving both equation.:
x=30 and y=30
total weight of all 60 students=60*40=2400
let no of boys be x and no of girls be y
total weight of boys =mean *number: 50*x
total weight of girls =mean *number.: 30 *y
therefore
(50x+30y) /60=40........(1..)
x+y=60...... (2.)
solving both equation.:
x=30 and y=30
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