Question
The average height of 30 boys is 165 cm and the average
height of another group of 25 boys is 172 cm. What is the average height (in cm) of all the boys together? (Round off to the nearest integer)Solution
ATQ,
Required average = (30 × 165 + 25 × 172) ÷ (30 + 25)
= (4950 + 4300) ÷ 55
= 9250 ÷ 55
= 168 cm
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