Question

there are 100 student in a class .the mean height of the class is 150 cm .if the mean height of 60 boys is 70cm , find the mean height of the girls in the class

Answer 1

sum of heights of all boys = 70*60 = 4200 cm
sum of heights of all students = 100(150) = 15000 cm

so, sum of heights of all girls = 15000 - 4200 = 10800 cm

Mean height of girls = 10800/no. of girls in class
no. of girls = 100 - 60 = 40

SO, mean height of girls = 10800/40 = 270 cm

pls mark brainliest !

Answer 2

Answer:

Answer:

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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@GauravSaxena01