New Enroll in RBI Grade B New Batch - Starts on May 21

    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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