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.
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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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