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    Question

    The data given below shows the marks obtained by 12

    different students in an exam. Marks obtained: 18, 22, 25, 28, 35, 39, 47, 50, 50, 64, 65, 85 Calculate the difference between the median and the mean of the marks obtained by 12 students:
    A 5 Correct Answer Incorrect Answer
    C 3 Correct Answer Incorrect Answer
    D 1 Correct Answer Incorrect Answer

    Solution

    Mean of the marks obtained = (18 + 22 + 25 + 28 + 35 + 39 + 47 + 50 + 50 + 64 + 65 + 85) ÷ 12 = 44 When the data in arranged in ascending order, average of the 6th and 7th observation = (39 + 47) ÷ 2 = 43 So, required difference = 44 - 43 = 1

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