Question

10. The mean height of 20 boys of a class is 150 cm. When a boy leaves the class, the mean
height comes down by 0.5 cm. Find the height of the boy.
Answer is 159.5
please explain ​

Answer 1

Answer:

Step-by-step explanation:

Hey there!

Let the height of the boy, who left the class be x cm.

Average height of 20 boys = 150 cm.

Total height of 20 boys/20 = 150

Total height of 20 boys = 3000

Avg. height of 19 boys = 150-0.5

= 149.5

Total height of 20 boys-Boys who left/19 = 149.5

Total height of 20 boys - x = 149.5 × 19

3000 - x = 2840.5

x = 159.5

Hence, height of the boy who left is 159.5 cm.

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