Multiple Choice Questions on The average weight of 40 students in a class is 75 kg By mistake the weights of two students are re........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

The average weight of 40 students in a class is 75 kg By mistake the weights of two students are re...........

Quantitative Aptitude ( CCS) Average
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    The average weight of 40 students in a class is 75 kg. By mistake the weights of two students are read as 74 kg and 66 kg respectively instead of 66 kg and 54 kg. Find the corrected average weight of the class?

    73.50 kg

    Incorrect Answer

    74.50 kg

    Correct Answer

    75.50 kg

    Incorrect Answer

    76.50 kg

    Incorrect Answer
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    Explanation:

    Weight of 40 students = 40*75
    new weight = 40*75 – 74 – 66 + 66 + 54 = 40*75 – 20
    so new average =( 40*75 – 20)/40 = 74.50 kg

    By: Sandeep Dubey
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