18. There are 100 students in a class. The mean height of the class is 150 cm. If the mean height of 60 boys is 70 cm, find the mean height of the girls in the class.
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total No of students in class = 100
the mean of height of class is = 150cm
if the mean height of 60 boys = 70cm
the the mean height of the girls in the class
Mean = sum of total Number of student / Number of students
=> total students=100
=> Number of boys =60
=> Number of girls=40
=> mean height of 100 students=150
Sum of heights of the 100 students=15000----(1)
=> Mean Height of 60 boys =70
Sum of heights of 60 boys =70×60=4200----(2)
Sum of the heights of 40 girls =(1) -(2)
=15000-4200
=10800
Mean height of 40 girls = 10800/40
=270 cm
the mean height of the girls in the class= 270 cm
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