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    Question

    The average speed of 20 vehicles during a survey was noted

    as 60 km/h. Later it was observed that one speed was wrongly taken as 72 km/h instead of 62 km/h, and another was noted as 55 km/h instead of 65 km/h. What is the actual average speed?
    A 48 km/h Correct Answer Incorrect Answer
    B 32 km/h Correct Answer Incorrect Answer
    C 58 km/h Correct Answer Incorrect Answer
    D 60 km/h Correct Answer Incorrect Answer

    Solution

    ATQ,

    Correct average = {(20 × 60) – 72 – 55 + 62 + 65}/20

    = {1200 – 127 + 127}/20

    = 1200 / 20

    = 60 km/h

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