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    Question

    The mean age of 30 students was calculated as 15 years.

    However, it was later discovered that one student's age was mistakenly entered as 15 years instead of 9 years. What is the accurate average age of the students?
    A 14.2 years Correct Answer Incorrect Answer
    B 16.4 years Correct Answer Incorrect Answer
    C 15.6 years Correct Answer Incorrect Answer
    D 14.8 years Correct Answer Incorrect Answer

    Solution

    Sum of ages of 30 students = 30 x 15 = 450 years Actual sum of ages of 30 students = (450 - 15 + 9) = 444 years Actual average of 30 students = (444/30) = 14.8 years

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