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7th Class Mathematics Data Handling Question Bank Self Test-14

  • question_answer
    The traffic police recorded the speed (in km/h) of 10 motors as 47, 53, 49, 60, 39, 42, 57, 55, 48 and 52. Later on an error in the recording instrument was found. Find the correct mean speed of the motors if the instrument recorded the speed 6 km/h less is each case.

    A)  55.2km/h

    B)  56.2 km/h

    C)  57.2 km/h

    D)  58.2 km/h

    E)  None of these

    Correct Answer: B

    Solution :

       


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