1. The average height of 30 boys out of a class of 50 is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is:
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By: anil on 05 May 2019 01.50 am
Total boys in class = 50 Average height of first 30 boys = 160 cm => Total height of 30 boys = $$30 imes 160=4800$$ cm Similarly, total height of remaining 20 boys = $$20 imes 165=3300$$ cm $$ herefore$$ Average height of the whole class = $$frac{(4800+3300)}{30+20}$$ = $$frac{8100}{50}=162$$ cm => Ans - (B)
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