Multiple Choice Questions on Four quantities are such that their arithmetic mean A M is the same as the A M of the first three qu........... for UPSC EPFO Exam Preparation

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Multiple Choice Questions

Four quantities are such that their arithmetic mean A M is the same as the A M of the first three qu...........

Quantitative Aptitude Statistics
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    Four quantities are such that their arithmetic mean (A.M.) is the same as the A.M. of the first three quantities. The fourth quantity is 

    This questions was previously asked in
    EPFO APFC (2015)
    View All EPFO Previous Year Papers

    Sum of the first three quantities 

    Incorrect Answer

    A.M. of the first three quantities

    Correct Answer

    (Sum of the first three quantities)/4 

    Incorrect Answer

    (Sum of the first three quantities)/2 
     

    Incorrect Answer
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    Explanation:

    A.M of 4 terms = A.M of the first 3 terms (given). Let's say 4 terms are a, b, c, and d. A.M of 4 terms = (a+b+c+d)/4. A.M of first 3 terms = (a + b + c)/3. Now,
    According to the given condition (a+b+c+d)/4 = (a + b + c)/3

    3*(a+b+c+d) = 4* (a + b + c)
    3d = a + b + c
    d = (a+b+c)/3
    So, d = A.M of first three terms

    By: Udit Singla
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