there are 100 student in a class . the mean height of the class is 150 cm. if the mean height of 60 boys is 170 cm. find the mean height of the girls in the class.
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average=sum/no.of student
150*100=sum of boy's+sum of girls
15000=60*170+ 40* x
15000-10200=40*x
4800=40*x
x=120
150*100=sum of boy's+sum of girls
15000=60*170+ 40* x
15000-10200=40*x
4800=40*x
x=120
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