Question

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 cmn. Find the height of the boy.​

Answer 1

Answer:

159.5 cm

Step-by-step explanation:

all 20 boy height is

20*150=3000

all 19 boy height is 19*149.5=2840.5

leaving boy height is. =159.50 cm

Answer 2

Answer:

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.

HOPE IT HELPED ^_^

your friend

#with_regards @Arsh