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Railways Quantitative Aptitude Average Sample Paper Average & Problems on Ages Sample Test Paper-7

  • question_answer
    The average marks of 65 students in a class was calculated as 150. It was later realised that the marks of one of the students was calculated as 142, whereas his actual marks were 152. What is the actual average marks of the group of 65 students? (Rounded off to two digits after decimal)

    A)  151.25

    B)  150.15

    C)  151.10

    D)  150.19

    Correct Answer: B

    Solution :

    [b] Actual average marks \[=\frac{65\times 150+152-142}{65}=\frac{9750+10}{65}=150.15\]


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