1. Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1m 12cm. The average height of all of them is
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By: anil on 05 May 2019 02.25 am
Total number of boys = 20 Total height of first 6 boys = $$6 imes1.15=6.9$$ m Total height of next 8 boys = $$8 imes1.10=8.8$$ m
Total height of last 6 boys = $$6 imes1.12=6.72$$ m
=> Average height = $$frac{(6.9+8.8+6.72)}{20}$$ = $$frac{22.42}{20}=1.121=$$ 1m 121 cm => Ans - (B)
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Total height of last 6 boys = $$6 imes1.12=6.72$$ m
=> Average height = $$frac{(6.9+8.8+6.72)}{20}$$ = $$frac{22.42}{20}=1.121=$$ 1m 121 cm => Ans - (B)