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    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)
    A 170 cm Correct Answer Incorrect Answer
    B 168 cm Correct Answer Incorrect Answer
    C 125 cm Correct Answer Incorrect Answer
    D 145 cm Correct Answer Incorrect Answer

    Solution

    ATQ,

    Required average = (30 ├Ч 165 + 25 ├Ч 172) ├╖ (30 + 25)

    = (4950 + 4300) ├╖ 55

    = 9250 ├╖ 55

    = 168 cm

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