Question

How many boys were sampled if their average height is 150 cm and sum of heights of all boys is 4500cm.?

Answer 1

let total number of boys be 'x'.

total height of all boys in class= 4500cm

average of height of all boys in the class= 150cm

and

average= total observation÷ number of observations

so,

average of boys in class = total height of all boys in class÷ number of boys in class

so,

according to question, the equation will be as follows-

4500÷x=150

x= 4500÷150

x= 30

so, total numeber if boys in the class is 30.