The average height of 25 boys is 1.4m . when 5 boys leave the group ,then the average height is increased by 0.15m. what is the average height of 5 boys who leave ?
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total sum of height of all 25 boys=25×1.4=35m
when 5 boys was leaved then these avarage=1.4+0.15=1.45
now total sum of height of all 20 boys =20×1.45=29
so total sum of height of leaved 5 boys =35-29=6
avarage height of leaved 5 boys =6/5=1.2m
when 5 boys was leaved then these avarage=1.4+0.15=1.45
now total sum of height of all 20 boys =20×1.45=29
so total sum of height of leaved 5 boys =35-29=6
avarage height of leaved 5 boys =6/5=1.2m
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Answer:
total sum of height of all 25 boys=25×1.4=35m
when 5 boys was leaved then these avarage=1.4+0.15=1.55
now total sum of height of all 20 boys =20×1.55=31
so total sum of height of leaved 5 boys =35-31=4
avarage height of leaved 5 boys =4/5=0.8m
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