Question

if the average height of 20 girls in the class is 130 cm and the average height of 20 boys is 134 cm what is the average height of all students in the class?​

Answer 1

Answer:

(20*130+20*134)/40=(2600+2680)/40

=5280/40

=132

Answer 2

Given :  average height of 20 girls in the class is 130 cm and the average height of 20 boys is 134 cm

To Find: The average height of all students in the class

Solution:

average height of 20 girls in the class = 130 cm

=> Total Height of girls  =   20 x 130  cm

average height of 20 boys in the class = 134 cm

=> Total Height of girls  =   20 x 134  cm

Total Height of class = 20 x 130  + 20  x 134

= 20 ( 130 + 134)

= 20 x 2 ( 65  + 67)

= 40 ( 132)  cm

Total students = 20 + 20 = 40

average height of all students in the class  = 40 ( 132) / 40

= 132 cm

Learn More:

There are 25 girls in a class. The average height of the girls is 130 ...

brainly.in/question/13680200

A researcher wishes to calculate the average height of patients ...

brainly.in/question/12694507